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GIVEN. ∠ RTQ RTS. 1 2 ,. QT ST. PROVE. If you can show that QRT SRT , you will know that QT ST. First, copy the diagram and mark the given. information. EXAMPLE 1. Use congruent triangles.
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GIVEN ∠ RTQ RTS 1 2, QTST PROVE If you can show that QRT SRT, you will know that QT ST. First, copy the diagram and mark the given information. EXAMPLE 1 Use congruent triangles Explain how you can use the given information to prove that the hanglider parts are congruent. SOLUTION
Mark given information. Add deduced information. Two angle pairs and a non-included side are congruent, so by the AAS Congruence Theorem, . Because corresponding parts of congruent triangles are congruent, QRT SRT QTST. EXAMPLE 1 Use congruent triangles Then add the information that you can deduce. In this case, RQT and RST are supplementary to congruent angles, so ∠ RQT RST. Also, RTRT .
Explain how you can prove that AC. AB BC Given AD DC Given BD BD Reflexive property ANSWER Thus the triangle by SSS ABDBCD for Example 1 GUIDED PRACTICE SOLUTION