Question

angle of a triangle are in AP the greatest girl is twice the least find all the angles of the triangle

Answer 1

Let a - d, a, a + d be the three angles of the triangle that form AP. 
Given that the greatest angle is twice the least. 
Now, 2(a - d) = a + d 2a - 2d = a + d a = 3d ---------------(1)Now by angle sum property, (a - d) + a + (a + d) = 180° 3a = 180° a = 60°----------------------(2) from (1) and (2), 3d = 60° d = 20° Now, the angles are, a - d = 60°- 20° = 40° a = 60° a + d = 60° + 20° = 80°.