Are the Angles of a Parallelogram 90 Degrees? According to the angle sum property of polygons, the sum of the interior angles of a polygon can be found by the formula, S = (n − 2) × 180°, where 'n' shows the number of sides in the polygon. The sum of the interior angles of a parallelogram is always 360°. What is the Sum of the Interior Angles of a Parallelogram? There are two basic theorems related to the angles of a parallelogram which state that the opposite angles of a parallelogram are equal and the consecutive (adjacent) angles are supplementary. No, all the angles of a parallelogram are not equal. The interior angles of a parallelogram sum up to 360° and any two adjacent (consecutive) angles of a parallelogram are supplementary. The angles made on the inside of a parallelogram and formed by each pair of adjacent sides are its interior angles. What are the Interior Angles of a Parallelogram?
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