As shown in the figure, △ ABC, angle a = 90 ° and bisector of angle c intersects AB at D. given angle DCB = 2 angle B, calculate the degree of angle ADC

So ∠ C + B = 5 * ∠ B = 90 degrees, so ∠ B = 90 / 5 = 18 degrees, ∠ ACD = 2 ∠ B = 36 degrees

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1. As shown in the figure, in △ ABC, the bisector of ∠ a = 90 ° intersects AB at D. if ∠ DCB = 2 ∠ B, calculate the degree of ∠ ADC
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