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Geometry Things to Remember

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Geometry
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geometry basics
Geometry Formulas

Copyright ? Regents Exam Prep Center Geometry ? Things to Remember! Regular Solids: Tetrahedron ? 4 faces Cube ? 6 faces Octahedron ? 8 faces Dodecahedron ? 12 faces Icosahedron ? 20 faces 3-D Figures: Prism: V = Bh Pyramid: 1 3 V Bh= Cylinder: 2V r h?= ; 22 2SA rh r? ?= + Cone: 2 1 3 V r h?= ; 2SA s r r? ?= + Sphere: 3 4 3 V r?= ; 2 24SA r d? ?= = Locus Theorems: Fixed distance from point. Fixed distance from a line. Equidistant from 2 points. Equidistant 2 parallel lines. Equidistant from 2 intersecting lines Polygon Interior/Exterior Angles: Sum of int. angles = 180( 2)n ? Each int. angle (regular) = 180( 2)n n ?

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