Question: Proving the Exterior Angle Theorem Given: AABC We start Prove: m ZZAB = m ZACB + mZCBA an exteri Angles Z VX Z A C

Proving the Exterior Angle Theorem Given: AABC We start Prove: m ZZAB = m ZACB + mZCBA an exteri Angles Z VX Z A C We know angle We also k because B Using sub X mZCAB Therefore

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