Question

Someone help me on this one

Answer 1

It's an isosceles triangle, so the angles at the base are congruent:

$m\anlge WXY=m\angle WZY$

The triangle XYW is a rectangular triangle.

We know that the sum of the measures of angles in a triangle is 180°.

Therefore we have the equation:

$m\angle YWZ+90^o+17^o=180^o\\\\m\angle YWZ+107^o=180^o\ \ \ |-107^o\\\\m\angle YWZ=73^o$

Answer: 73