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A heptagon has 7 sides.

sum_of_interior_angles = (number_of_sides - 2) x 180o

⇒ sum_of_angles_for_heptagon = 5 x 180o = 900o

⇒ interior_angle_of_regular_heptagon = 900o ÷ 7 = 1284/7o ~= 128.6o.

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Q: What is the measure of one of the interior angle of a regular heptagon?
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