Mathematics, 26.07.2019 02:20 sammypaige08

Britton rotated trapezoid abcd 180° on the coordinate plane. if angle b is 20° and angle d is 90°, what is the degree measurement of angle b′?

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Britton rotated trapezoid abcd 180° on the coordinate plane. if angle b is 20° and angle d is 90°, w...