Answer:
Angle A = 58
Step-by-step explanation:
The exterior angle of a triangle is equal to the sum of the opposite interior angles
? + 80 = 138
Subtract 80 from each side
? + 80-80 =138 - 80
? = 58
56.31 is r
Hope it helps!!!
divide 8.4 with 3
the answer is 2.8
