zikehevubu zikehevubu
  • 22-05-2019
  • Mathematics
contestada

What is the measure of angle A?

What is the measure of angle A class=

Respuesta :

jimrgrant1 jimrgrant1
  • 22-05-2019

Answer:

∠A = 58°

Step-by-step explanation:

The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.

∠ACD is an exterior angle

∠A and ∠B are the opposite interior angles, thus

∠A + 80 = 138 ( subtract 80 from both sides )

∠A = 58°

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