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Language Arts Curriculum Standards
3108 - Geometry
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Internet Resources |
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Check solutions after making reasonable estimates in appropriate units of quantities encountered in contextual situations.
3108.1.1 |
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Determine position using spatial sense with two and three-dimensional coordinate systems.
3108.1.2 |
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Comprehend the concept of length on the number line.
3108.1.3 |
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Recognize that a definition depends on undefined terms and on previous definitions.
3108.1.4 |
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Use technology, hands-on activities, and manipulatives to develop the language and the concepts of geometry, including specialized vocabulary (e.g. graphing calculators, interactive geometry software such as Geometer’s Sketchpad and Cabri, algebra tiles, pattern blocks, tessellation tiles, MIRAs, mirrors, spinners, geoboards, conic section models, volume demonstration kits, Polydrons, measurement tools, compasses,
PentaBlocks, pentominoes, cubes, tangrams).
3108.1.5 |
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Use inductive reasoning to write conjectures and/or conditional statements.
3108.1.6 |
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Recognize the capabilities and the limitations of calculators and computers in solving problems.
3108.1.7 |
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Understand how the similarity of right triangles allows the trigonometric functions sine, cosine, and tangent to be defined as ratio of sides.
3108.1.8 |
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Expand analysis of units of measure to include area and volume.
3108.1.9 |
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Use visualization, spatial reasoning, and geometric modeling to solve problems.
3108.1.10 |
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Identify and sketch solids formed by revolving two-dimensional figures around lines.
3108.1.11 |
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Connect the study of geometry to the historical development of geometry.
3108.1.12 |
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Use proofs to further develop and deepen the understanding of the study of geometry (e.g. two-column, paragraph, flow, indirect, coordinate).
3108.1.13 |
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Identify and explain the necessity of postulates, theorems, and corollaries in a mathematical system.
3108.1.14 |
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Give precise mathematical descriptions or definitions of geometric shapes in the plane and space.
SPI 3108.1.1 |
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Determine areas of planar figures by decomposing them into simpler figures without a grid.
SPI 3108.1.2 |
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Use geometric understanding and spatial visualization of geometric solids to solve problems and/or create drawings.
SPI 3108.1.3 |
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Use definitions, basic postulates, and theorems about points, lines, angles, and planes to write/complete proofs and/or to solve problems.
SPI 3108.1.4 |
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Language Arts Curriculum Standards
3108 - Geometry
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Internet Resources |
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Recognize that there are geometries, other than Euclidean geometry, in which the parallel postulate is not true and discuss unique properties of each.
3108.4.1 |
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Compare and contrast inductive reasoning and deductive reasoning for making predictions and valid conclusions based on contextual situations.
3108.4.2 |
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Solve problems involving betweeness of points and distance between points (including segment addition).
3108.4.3 |
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Describe and recognize minimal conditions necessary to define geometric objects.
3108.4.4 |
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Use vertical, adjacent, complementary, and supplementary angle pairs to solve problems and write proofs.
3108.4.5 |
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Describe the intersection of lines (in the plane and in space), a line and a plane, or of two planes.
3108.4.6 |
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Identify perpendicular planes, parallel planes, a line parallel to a plane, skew lines, and a line perpendicular to a plane.
3108.4.7 |
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Apply properties and theorems about angles associated with parallel and perpendicular lines to solve problems.
3108.4.8 |
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Classify triangles, quadrilaterals, and polygons (regular, non-regular, convex and concave) using their properties.
3108.4.9 |
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Identify and apply properties and relationships of special figures (e.g., isosceles and equilateral triangles, family of quadrilaterals, polygons, and solids).
3108.4.10 |
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Use the triangle inequality theorems (e.g., Exterior Angle Inequality Theorem, Hinge Theorem, SSS Inequality Theorem, Triangle Inequality Theorem) to solve problems.
3108.4.11 |
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Apply the Angle Sum Theorem for polygons to find interior and exterior angle measures given the number of sides, to find the number of sides given angle measures, and to solve contextual problems.
3108.4.12 |
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Locate, describe, and draw a locus in a plane or space (e.g., fixed distance from a point on a plane, fixed distance from a point in space, fixed distance from a line, equidistant from two points, equidistant from two parallel lines, and equidistant from two intersecting lines).
3108.4.13 |
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Identify and use medians, midsegments, altitudes, angle bisectors, and perpendicular bisectors of triangles to solve problems (e.g., find segment lengths, angle measures, points of concurrency).
3108.4.14 |
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Identify, write, and interpret conditional and bi-conditional statements along with the converse, inverse, and contra-positive of a conditional statement.
3108.4.15 |
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Analyze and create truth tables to evaluate conjunctions, disjunctions, conditionals, inverses, contra-positives, and bi-conditionals.
3108.4.16 |
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Use the Law of Detachment, Law of Syllogism, conditional statements, and bi-conditional statements to draw conclusions.
3108.4.17 |
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Use counterexamples, when appropriate, to disprove a statement.
3108.4.18 |
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Use coordinate geometry to prove properties of plane figures.
3108.4.19 |
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Prove key basic theorems in geometry (i.e., Pythagorean Theorem, the sum of the angles of a triangle is 180 degrees, characteristics of quadrilaterals, and the line joining the midpoints of two sides of a triangle is parallel to the third side and half its length).
3108.4.20 |
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Use properties of and theorems about parallel lines, perpendicular lines, and angles to prove basic theorems in Euclidean geometry (e.g., two lines parallel to a third line are parallel to each other, the perpendicular bisectors of line segments are the set of all points equidistant from the endpoints, and two lines are parallel when the alternate interior angles they make with a transversal are congruent).
3108.4.21 |
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Perform basic geometric constructions using a straight edge and a compass, paper folding, graphing calculator programs, and computer software packages (i.e., bisect and trisect segments, congruent angles, congruent segments, a line parallel to a given line through a point not on the line, angle bisector, and perpendicular bisector).
3108.4.22 |
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Describe the polyhedron or solid that can be made from a given net including the Platonic Solids.
3108.4.23 |
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Develop and use special formulas relating to polyhedra (e.g., Euler’s Formula).
3108.4.24 |
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Use properties of prisms, pyramids, cylinders, cones, spheres, and hemispheres to solve problems.
3108.4.25 |
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Describe and draw cross-sections (including the conic sections) of prisms, cylinders, pyramids, spheres, and cones.
3108.4.26 |
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Use right triangle trigonometry to find the area and perimeter of quadrilaterals (e.g. square, rectangle, rhombus, parallelogram, trapezoid, and kite).
3108.4.27 |
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Derive and use the formulas for the area and perimeter of a regular polygon.
(A=1/2 ap)
3108.4.28 |
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Extend the effect of a scale factor k in similar objects to include the impact on volume calculations and transformations.
3108.4.29 |
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Use right triangle relationships or the Pythagorean Theorem to find the lateral area (if possible), surface area, and volume of prisms, cylinders, cones, pyramids, spheres, and hemispheres.
3108.4.30 |
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Use properties of single transformations and compositions of transformations to determine their effect on geometric figures (e.g. reflections across lines of symmetry, rotations, translations, glide reflections, and dilations).
3108.4.31 |
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Recognize, identify and apply types of symmetries (point, line, rotational) of two- and three- dimensional figures.
3108.4.32 |
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Use transformations to create and analyze tessellations and investigate the use of tessellations in architecture, mosaics, and artwork.
3108.4.33 |
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Create and analyze geometric designs using rigid motions (compositions of reflections, translations, and rotations).
3108.4.34 |
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Prove that two triangles are congruent by applying the SSS, SAS, ASA, AAS, and HL congruence statements.
3108.4.35 |
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Use several methods, including AA, SSS, and SAS, to prove that two triangles are similar.
3108.4.36 |
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Identify similar figures and use ratios and proportions to solve mathematical and real-world problems (e.g., Golden Ratio).
3108.4.37 |
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Use the principle that corresponding parts of congruent triangles are congruent to solve problems.
3108.4.38 |
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Identify lines and line segments associated with circles.
3108.4.39 |
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Find angle measures, intercepted arc measures, and segment lengths formed by radii, chords, secants, and tangents intersecting inside and outside circles.
3108.4.40 |
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Use inscribed and circumscribed polygons to solve problems concerning segment length and angle measures.
3108.4.41 |
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Use geometric mean to solve problems involving relationships that exist when the altitude is drawn to the hypotenuse of a right triangle.
3108.4.42 |
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Apply the Pythagorean Theorem and its converse to triangles to solve mathematical and contextual problems in two- or three-dimensional situations.
3108.4.43 |
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Identify and use Pythagorean triples in right triangles to find lengths of an unknown side in two- or three-dimensional situations.
3108.4.44 |
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Use the converse of the Pythagorean Theorem to classify a triangle by its angles (right, acute, or obtuse).
3108.4.45 |
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Apply properties of 30° - 60° - 90° and 45° - 45° - 90° to determine side lengths of triangles.
3108.4.46 |
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Find the sine, cosine and tangent ratios of an acute angle of a right triangle given the side lengths.
3108.4.47 |
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Define, illustrate, and apply angles of elevation and angles of depression in real-world situations.
3108.4.48 |
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Use the Law of Sines (excluding the ambiguous case) and the Law of Cosines to find missing side lengths and/or angle measures in non-right triangles.
3108.4.49 |
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Differentiate between Euclidean and non-Euclidean geometries.
SPI 3108.4.1 |
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Define, identify, describe, and/or model plane figures using appropriate mathematical symbols (including collinear and non-collinear points, lines, segments, rays, angles, triangles, quadrilaterals, and other polygons).
SPI 3108.4.2 |
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Identify, describe and/or apply the relationships and theorems involving different types of triangles, quadrilaterals and other polygons.
SPI 3108.4.3 |
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Analyze different types and formats of proofs.
SPI 3108.4.4 |
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Describe solids and/or surfaces in three-dimensional space when given two-dimensional representations for the surfaces of three-dimensional objects.
SPI 3108.4.5 |
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Use various area of triangle formulas to solve contextual problems (e.g., Heron’s
formula, the area formula for an equilateral triangle, and A = ½ ab sin C).
SPI 3108.4.6 |
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Compute the area and/or perimeter of triangles, quadrilaterals and other polygons when one or more additional steps are required (e.g. find missing dimensions given area or perimeter of the figure, using trigonometry).
SPI 3108.4.7 |
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Solve problems involving area, circumference, area of a sector, and/or arclength of a circle.
SPI 3108.4.8 |
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Use right triangle trigonometry and cross-sections to solve problems involving surface areas and/or volumes of solids.
SPI 3108.4.9 |
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Identify, describe, and/or apply transformations on two and three dimensional geometric shapes.
SPI 3108.4.10 |
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Use basic theorems about similar and congruent triangles to solve problems.
SPI 3108.4.11 |
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Solve problems involving congruence, similarity, proportional reasoning and/or scale factor of two similar figures or solids.
SPI 3108.4.12 |
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Identify, analyze and/or use basic properties and theorems of circles to solve problems (including those relating right triangles and circles).
SPI 3108.4.13 |
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Use properties of right triangles to solve problems (such as involving the relationship formed when the altitude to the hypotenuse of a right triangle is drawn).
SPI 3108.4.14 |
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Determine and use the appropriate trigonometric ratio for a right triangle to solve a contextual problem.
SPI 3108.4.15 |
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National Library of Virtual Manipulatives |
- Geometry [Grades 9-12]

- Measurement [Grades 9-12]

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