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Symmetry and Space Classifying Two- and Three-Dimensional Solids Two-Dimensional Representations of Three-Dimensional Objects Triangles Similarity and Ratio Convex Polygons Quadrilaterals Straightedge and Compass Constructions Skew Lines Special Triangles Area of Triangles and Special Quadrilaterals The Pythagorean Theorem Circles The Equation of a Circle Geometric Proofs using Coordinate Systems ⬅ Back to Table of Contents