prove the sum of three angle is 180 if the
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Step-by-step explanation:
FROM Δ ABC
draw a parallel line DE ║ BC
∠DAB + ∠BAC +∠CAE = 180
∠DAB = ∠ABC (ALTERNATE ANGLES ARE EQUAL)
∠CAE = ∠ACB (ALTERNATE ANGLES ARE EQUAL)
SO, ∠ABC + ∠ACB + ∠BAC =180
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see the answer photo is inserted
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