3 years ago

The polygon is a regular nonagon (9-sides). What is the sum of the interior angles? What is the measurement for each angle?

1 answer:

6 0

Divide the nonagon radially into 9 congruent, equilateral isosceles triangle. Each triangle has vertex angle of 360°/9 = 40°.
Interior angle of polygon = 180°-40° = 140°.
Sum of interior angles = 9(140°) = 1260°

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