. In the given figure, AB || DC. If ∠A = 50°, then find the measure of ∠ABC.
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Answer:
if AB//BC
angA+ ang B + ang C = 180
50⁰ + angle B + 50⁰ = 180
100⁰ + ang B = 180⁰
ang B = 180⁰- 100⁰
ang B = 80 ⁰
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