Step 1: Before going to answer the question understand the question.

Step 2: Know the equilateral triangle properties

            NOTE: Three equal sides 

                Three equal angles, always 60°

Step 3: Find the unknown values  

            NOTE: Since it is an equilateral triangle all its angles would be 60°. The

              size of the angle does not depend on the length of the side.

            EXAMPLE: The size of the angle is 60°.