![]() The formula that is used for finding the sum of interior angles is (n − 2) × 180°, where n is the number of sides. For this, we need to multiply the number of triangles in the polygon by the angle of 180°. We have the formula to find the sum of interior angles of a polygon. What Is the Angle Sum Formula for Polygons? The sum of the interior angles in a triangle is supplementary. This is the formula for the angle sum theorem. ![]() In this given triangle ABC, ∠a + ∠b + ∠c = 180°. What Is the Formula for Triangle Sum Theorem?Ĭonsider a triangle ABC. All of these triangles have three angles and they all follow the triangle sum theorem. There are different types of triangles in mathematics as per their sides and angles.
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