Question

Prove that the sum of the three angles of a triangle is 180°. Hence deduce that if one side of a triangle is produced the exterior angle so formed is equal to the sum remote of the interior angles of triangle

Answer 1

angle sum property of triangle is equal to 180 degree angle 1 = angle 2 + angle 3 is equal to 180 degree now angle 1 is equal to angle 2 and angle 2 is equals to angle C it means angle 1 is equals to 3 all angles are equal now right angles in just one form like you angle 1 + 1 + 1 is equals to 180 degree divided by 313 angle is 60 degree