This is a Geometry question.

a)

We have equilateral triangle and a rhombus. 

You need mark out the 60 first.

Then 39 × 2 = 78. Diagonal cut the angle into half.

Then you highlight the parallel line of the rhombus.  You can see a C shape. Find the angle YWV.

b) 

Find VWX.

Then find the base angles of this isosceles triangle VWX.