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Explain why m∠9 is equal to the sum of the measures of the two nonadjacent interior angles.
What is m∠9?

Answer 1

because all triangle's interior angles add up to 180 degrees so and angles 8 and 9 are supplementary. Angle 9 is 77 degrees.

Explanation:

because all triangle's interior angles add up to 180 degrees so and angles 8 and 9 are supplementary. Angle 9 is 77 degrees.