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ASA and AAS Congruence. Section 4.5. Angle-Side-Angle (ASA) Congruence Postulate. If two angles and the included side of one triangle are congruent to two angles and the included side of a second triangle, then the two triangles are congruent. Angle-Angle-Side (AAS) Congruence Theorem.
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ASA and AAS Congruence Section 4.5
Angle-Side-Angle (ASA) Congruence Postulate • If two angles and the included side of one triangle are congruent to two angles and the included side of a second triangle, then the two triangles are congruent.
Angle-Angle-Side (AAS) Congruence Theorem • If two angles and a non-included side of one triangle are congruent to two angles and the corresponding non-included side of a second triangle, then the two triangles are congruent.
In the diagram at the right, what postulate or theorem can you use to prove that ? Explain. RSTVUT STATEMENTS REASONS Given S U Given RS UV The vertical angles are congruent RTSUTV GUIDED PRACTICE SOLUTION
RTSUTV GUIDED PRACTICE ANSWER Therefore are congruent because vertical angles are congruent so two pairs of angles and a pair of non included side are congruent. The triangle are congruent by AAS Congruence Theorem.
Quick reference on pg. 252 • These are the only 5 ways to prove triangles are congruent • There is no SSA or AAA.
Assignment • p. 252: 3-10, 14-17