Math - Geometry

• 3D Coordinates (In Space)
• Angles
• Arcs
• Area Formulas
• Classifying Triangles
• Compass/Protractor Constructions
• Congruent Triangles
• Deductive Reasoning
• Dilations
• Geometric Mean
• Geometric Probability
• Graphing Linear Equations
• Inscribed Angles
• Intro to Trigonometry
• Line
• Loci and Transformations
• Mappings (Tessellations)
• Networks
• Pairs of Angles
• Parallels
• Parallels and Transversals
• Parts of Circles
• Planes
• Points
• Polygon Angles
• Polygon Parts
• Polygons and Polyhedra
• Prisms
• Proofs
• Pyramids and Cones
• Quadrilaterals
• Rays/Angles
• Reflections
• Right Triangles
• Rotations
• Segments
• Similar Polygons
• Similar Triangles
• Space
• Statements
• Surface Area Formulas
• Tangents
• Translations
• Triangle Centers
• Triangle Inequality
• Triangle Parts
• Triangle Segments
• Vectors
• Volume Formulas

Similar Triangles

Triangle similarity, ratios of area Similar triangles - ratio of areas is the square of the ratio of the sides. Math Open Reference

Similar Triangles - Angles, Sides and Similarity Ratio This site gives a brief explanation of similar triangles with examples and practice problems for finding the similarity ratio of two similar triangles. Math Warehouse

Similar Triangles Video This website contains a video tutorial on similar triangles along with setting up proportions to solve them. Algebra.com

Similar Triangles A description and interactive page defining similar triangles and explaining the meaning of their sides being in proportion to one another. Also introduces theorems for proving triangles are similar. Math Open Reference