If one angle of a parallelogram is 60 degrees, find the number of degree of remaining angles.

A 60, 60, 60
B 30, 60, 90
C 60, 120, 120
D 60, 120, 150

Correct Answer: 60, 120, 120

Opposite angles of a parallelogram are equal. So, the angle opposite to 60° is also 60°. Now, sum of the 4 angles is 360°. So, sum of the other two opposite angles is {360 - (60 + 60)} = 360 - 120 = 240° So, each of the other angles is = 240/2 = 120°. So, the other three angles are 60°, 120°, 120°.
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