Question 965410
1) The angles of every triangle add up to 180 degrees
2) Every right angle triangle has a 90 degree angle, a right angle. The right angle in the triangle rarely, if ever, shows the degrees. Instead there is a little box in its vertex (in its corner where the two lines meet like an L)
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In your case:
62 = one angle (given by the problem)
90 = problem says it's a right angle triangle, so it has a 90 deg. angle
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152 
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Since the angles in every triangle add up to 180:
180-152 = 28 degrees is your third angle