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Hace 18 horas · Prove: m∠ZAB = m∠ACB + m∠CBA. 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 ______ .
