Question

If angles A, B, C to a ∆ABC from an increasing AP, then sin B =

(a) $\frac{1}{2}$
(b) $\frac{\sqrt{3}}{2}$
(c) 1
(d) $\frac{1}{\sqrt{2}}$

Answer 1

Let the angles of a triangleberespectively which constitute an A.P.As we know that sum of all the three angles of a triangle is. So,

So,

Therefore,

Hence,

So answer is