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In trapezoid ABCD, sides AB and CD are parallel, angle A =2* angle D, and C = 3*angle B. Find angle B.

 Nov 10, 2018
edited by Lightning  Nov 10, 2018

Best Answer 

 #1
avatar+18133 
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Since the sides are parallel,   angles B and C add to 180 degrees I(supplementary)

 

C= 3B        C+B = 180      Substitute     3B + B = 180     4B = 180    B = 45 degrees

 Nov 11, 2018
 #1
avatar+18133 
+2
Best Answer

Since the sides are parallel,   angles B and C add to 180 degrees I(supplementary)

 

C= 3B        C+B = 180      Substitute     3B + B = 180     4B = 180    B = 45 degrees

ElectricPavlov Nov 11, 2018

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