BASIC GEOMETRY Section 7.3: Triangle Similarity: AA, SSS, &amp; SAS

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# BASIC GEOMETRY Section 7.3: Triangle Similarity: AA, SSS, &amp; SAS - PowerPoint PPT Presentation

BASIC GEOMETRY Section 7.3: Triangle Similarity: AA, SSS, &amp; SAS. Proving Triangles are Similar. AA ~ Thm: If two angles of one triangle are congruent to two angles in another triangle, then the triangles are similar.

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### BASIC GEOMETRYSection 7.3: Triangle Similarity: AA, SSS, & SAS

Proving Triangles are Similar
• AA ~ Thm: If two angles of one triangle are congruent to two angles in another triangle, then the triangles are similar.

SSS ~ Thm: If the 3 sides of one triangle are proportional to 3 sides of another triangle, then the triangles are ~.

SAS ~ Thm: If two sides of one triangle are proportional to two sides of another and the included angles are congruent, then the triangles are ~.

Proofs
• These 3 Thms are used the same as the congruent triangles ones in proofs.
• Properties of Similarity
Example 2: Verify that the triangles are similar.

A) ∆PQR & ∆STU B) ∆DEF & ∆HJK

Assignment #3
• Page 474 #’s 1-6,9,10,34-36,(44)