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larisa86 [58]
3 years ago
13

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. f

ind the measures of angle a
Mathematics
1 answer:
lord [1]3 years ago
3 0
180=2a+a+120
180-120=3a
60=3a
a=60/3
a=20
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