Question

Segment GH is the diameter of a circle. If point K is located on the circle, which of the following could be the measure of angle GHK
A 59°
B 99°
C 123°
D 180°

Answer 1

I think the answer is A not sure

Answer 2

Check the picture below

now, based on Thales theorem, the angle at K will always be 90°, that means, the other two angles, G and H, will always share the other 90°, since the sum of all internal angles is 180°, so, either G or H, will never be 90°, will always be less than 90°, always an acute angle