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Please answer my question

Please answer my question-example-1

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If angle B=50 and D=90, then angle C must =40 degrees (all 3 angles always add up to 180).
Line EF is a straight line (180 degrees)...so if angle C inside the triangle is 40, then the measure of angle BCF = 140 degrees (180-40=140)
User Ragavan Rajan
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Answer:

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User James Zilch
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