Probably the answer being looked for here is a straight angle (180 degrees) but the truth is that by 9:15 the hour hand is a little past the 9.
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A right angle which is 90 degrees
The angle between the hands of a clock when it is 9:15 is a bit more than 180 degrees. Depending on how the clock works, t might be 185 degrees or so (175 if you look at the opposite angle.
A straight-angle. 180o.
90 degrees - a right angle
an acute angle - of 30 degrees.