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7.4 A Postulate for Similar Triangles

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We can prove that 2 triangles are similar by showing that all 3 corresponding angles are congruent, and all 3 sides are in proportion to one another (same as showing any 2 polygons similar) But there are simpler methods to prove 2 triangles similar.

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AA Similarity Postulate If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.

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Are these triangles similar, if so, then why? Can you find x? And AE and ED? What is the scale factor?

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Homework pg. 257 1-17

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Proving Side-Side-Side. Proving Side-Angle-Side Create a 55 ° angle. Its two sides should be 3.5 and 5 inches long. Enclose your angle to make a triangle.

Proving Side-Side-Side. Proving Side-Angle-Side Create a 55 ° angle. Its two sides should be 3.5 and 5 inches long. Enclose your angle to make a triangle.

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