Imagine two clock hands two minutes apart.
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60 degree angle at 4:12 At 4.00 the angle is 120 degrees. In 12 minutes the minute hand moves 72 degrees while the hour hand moves 6 degrees. So that 120 degree angle reduces by 66 degrees in 12 minutes, and the answer is 54 degrees.
180 degree angle
We know angle of incidence = angle of reflection. Hence, angle of incidence will be 24/2 = 12 degrees. (which is also angle of reflection)
A 45-degree angle is an acute angle
A 90 degree angle is a right angle