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90 degree or Right Angle
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.
A right angle triangle is made up of one 90 degree angle and two acute angles and the three angles add up to 180 degrees.
The answer depends on which angle is given: whether it is the angle made by the sloping face with the base, or the angle at the apex or even the angle that the sloping face makes with the vertical. Essentially, though, you use Pythagoras's theorem or, equivalently, the sine rule.
A protractor will indicate an angle that has to be made.