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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

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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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

User Jack Arnestad
by
8.1k points

1 Answer

4 votes
180=2a+a+120
180-120=3a
60=3a
a=60/3
a=20
User LKarma
by
8.6k points
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