absha1216
absha1216 absha1216
  • 08-01-2017
  • Mathematics
contestada

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 alexfabre08
  • 08-01-2017
180=2a+a+120
180-120=3a
60=3a
a=60/3
a=20
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