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OpenStudy (anonymous):
In trapezoid ABCD, find m∠A if m∠B= 25°, m∠C = 155° and m∠ D= 117°.
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OpenStudy (anonymous):
all corners combined in a 4 corner shape = 360 degrees 360 - angle b -angle c - angle d = angle A
OpenStudy (anonymous):
angle A = 360 - angle B-angle C- angle D = 360-25-155-117 = 63 degrees
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