Sum of the 3 angles in a triangle is 180 July 8, 2019 16 32 64 128 Sum of the 3 angles in a triangle is 180° Prove that the sum of the 3 angles of a triangle is 180 Supplement of an angle The sum of the angles of a triangle is 180 In a right triangle one angle measures x° where sin ° = x 4 5 . what is cos(90° − °) x
