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Proportion

A statement that two ratios are equal.

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Similarity Ratio

The ratio of the lengths of two corresponding sides.

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Cross-Product Property

The product of the means is equal to the product of the extremes.

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Golden Rectangle

A rectangle that can be divided into a square and a rectangle that is similar to the original triangle.

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Similar

Corresponding angles are congruent and corresponding sides are in proportion.

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AA Similarity

Two triangles are similar if two pairs of corresponding angles are congruent.

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SAS Similarity

Two triangles are similar if an angle of one triangle is congruent to an angle of a second triangle, and the sides including those angles are in proportion.

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SSS Similarity

Two triangles are similar if the corresponding sides of two triangles are in proporiton.

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Side-Splitter Theorem

If a line is parallel to one side of a triangle and intersects the other two sides, then it divides those sides proportionally.

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