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117-81=36°

Angle 4 cause it's vertically opposite angle

Step-by-step explanation:

b + 81° = 117° { exterior angle of a triangle is equal to the sum of two opposite interior angles }

b = 117° - 81°

b = 36°

for no. 14

The angles that are congruent to < 1 are < 4 and < 8.

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step-by-step explanation:

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