A. The sum of all the interior angles in a polygon is
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(n-2)x 180 degrees : The formula for finding the sum of all angles in a polygon (REGULAR).
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To find the sum of interior angles of a polygon, multiply the number of triangles in the polygon by 180°. The formula for calculating the sum of interior angles is ( n − 2 ) × 180 ∘ where is the number of sides. All the interior angles in a regular polygon are equal.
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