The sum of the interior angles of a geometrical figure laid on the surface of the earth differs from that of the corresponding plane figure only to the extent of one second for every

To find the interior angle sum of a polygon, we can use a formula: interior angle sum = (n – 2) x 180°, where n is the number of sides. For example, a pentagon has 5 sides, so its interior angle sum is (5 – 2) x 180° = 3 x 180° = 540°.