Angles of a are in Arithmetic progression & , then
Explanation for the correct option:
Step 1. Find the value of angle
Given, angles of a triangle are in
Let represent angles and
We know that
sum of angles of triangle
So
Also Given,
By sine rule, We know that, If and are angles and, and are the sides of , then:
….(1)
Step 2. Put the value of in equation (1), we get
So
Step 3. Put the values of angle in
Hence, Option ‘C' is correct Answer.