Question

prove that sum of three angle of a triangle is 2 right angle​

Answer 1

★Ｍʀ々Ｍᴏɴsᴛᴇʀ★

In a triangle, the sum of the three interior angles equals two right angles. In the words of Euclid: In any triangle, if one of the sides be produced, the exterior angle is equal to the two interior and opposite angles, and the three interior angles of the triangle are equal to two right angles.