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In triangle $ABC$, the measure of $\angle A$ is $86$ degrees. The measure of $\angle B$ is $25$ degrees more than three times the measure of $\angle C$. What is the measure, in degrees, of $\angle C$?

 Mar 22, 2021
 #1
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A  + B  +  C   = 180

 

86  +  (3C + 25)  +  C  =  180      simplify

 

86  +  25  +  4C  = 180

 

111  +  4C  = 180

 

4C =   180  -  111

 

C  =  ( 180 - 111)  / 4  =   17.25°

 

 

cool cool cool

 Mar 22, 2021

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