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

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Answer: Option C

Explanation:

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°.