absha1216 absha1216

08-01-2017
Mathematics

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in triangle abc the measure of angle b is twice the measure of angle a and an exterior angle at vertex c measures 120 degrees. find the measures of angle a

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alexfabre08 alexfabre08

08-01-2017

180=2a+a+120
180-120=3a
60=3a
a=60/3
a=20

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