The value 180 comes from how many degrees are in a triangle. A triangle is a polygon with three sides and three angles. Remote Exterior And Interior Angles Of A Triangle Interior And Exterior Angles Teaching Geometry Exterior Angles If c is the length of the longest side then a 2 b 2 c 2 where a and b are the lengths of the other sides. . The formula is derived considering that we can divide any polygon into triangles. The angle measures A B and C of the angles of the vertices opposite the respective sides a b and c with the vertices denoted with the same symbols as their angle measures. Angles opposite to equal sides are equal. Remote Exterior And Interior Angles Of A Triangle. The sum of interior angles of any polygon can be calculated using a formula. Respond to each with Yes or No. The angle sum property states that the interior angles of a triangle add up to 180. The interior angles of a triangle alwa