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It depends how many sides the polygon with equal angles has.

sum_of_interior_angles = 180° × (number_of_sides - 2)

equiangular_interior_angle = sum_of_interior_angles ÷ number_of_sides

→ equiangular_interior_angle = 180° × (number_of_sides - 2) ÷ number_of_sides

So for:

equilateral triangle: number_of_sides = 3 → equiangular_interior_angle = 180° × (3 - 2) ÷ 3 = 60°

equiangular quadrilateral: number_of_sides = 4 → equiangular_interior_angle = 180° × (4 - 2) ÷ 4 = 90°

equiangular pentagon: number_of_sides = 5 → equiangular_interior_angle = 180° × (5 - 2) ÷ 5 = 108°

equiangular hexagon: number_of_sides = 6 → equiangular_interior_angle = 180° × (6 - 2) ÷ 6 = 120°

etc.

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