Ok, so:
Let me put the figure here below:
Ok, we have these facts:
The angle B measures 90°
The angle BCD measures 90°
The angle BAD measures 125°.
Now, it would be useful to find the measure of the angle ADC and then see what happen with GHE.
So, we know that the sum of the internal angles of a quadrilateral is equal to 360°, and the figure we got is actually a quadrilateral. So:
90° + 90° + 125° + ADC = 360°
ADC = 360° - 90° - 90° - 125°
ADC = 55°.
Now, notice that the next figure is a similar quadrilateral of the first one, and it has the same angles.
So, the mesure of angle GHE = the measure of angle ADC.
So, m