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In trapezoid ABCD, sides AB and CD are parallel, angle A = 2*angle D, and angle C = 4*angle B. Find angle A .

 Dec 29, 2020
 #1
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Since   AB  is parallel to  CD, then angle A  and angle D  are supplementary

 

And D  = (1/2)A

 

So   

 

A + (1/2)A  = 180

 

(3/2)A  =180

 

A = (2/3)(180)  =  120°

 

cool cool cool

 Dec 29, 2020

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