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We start with triangle ABC and see that angle ZAB is an exterior angle created by the extension of side AC. Angles ZAB and CAB are a linear pair by definition. We know that m∠ZAB m∠CAB = 180° by the . We also know m∠CAB m∠ACB m∠CBA = 180° because . Using substitution, we have m∠ZAB m∠CAB = m∠CAB m∠ACB m∠CBA. Therefore, we conclude m∠ZAB = m∠ACB m∠CBA using the .

Respuesta :

Answer:

1. angle addition postulate 2. of the triangle theorem 3. subtraction property

Explanation:

i got it right on edge ma dudes

Answer:

1.A 2.C 3.C

Explanation:

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ps. jk but these r the answers