Q.

The sum of the supplementary angles is _________.

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a

45°

b

60°

c

90°

d

180°

answer is A.

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Detailed Solution

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The sum of two supplementary angles is 180°.

If the sums of two angles are 180°  the angles are called Supplementary angles.

For example, 

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In the given figure, the measure of angle AOB  is 150 and that of angle AOC is 30o.  The sum of the measure of both angles is 150 + 30o.  = 180o. So these angles are called supplementary angles

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