Calculate the value of the exterior angle
1 answer:
An exterior angle of the triangle equals to the sum opposite interior angles, so
8x+15 = (4x+5) + (3x+20)
8x +15 = 7x +25
x=10
Now, we can calculate the exterior angle.
8x+15 = 8*10 + 15 = 80+15 = 95
Answer is 95⁰.
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