Of what?
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It depends on what "this measurement" refers to: the radius, circumference, length of arc with a known angle.
180 minus two known angle = missing angle. Use Pythagoras' theorem to find its missing side.
The entire circumference has a central angle of 360 degrees. The arc is a fraction of the circumference. The fraction is (central angle) divided by (360). So the arc length is: (circumference) x (central angle) / (360) .
67.5 degrees
In order to find the Area, you multiply BXH (XW) so when finding the missing measurement you do Area/B (or H).