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Q.

Two angles whose sum is equal to 180° are called:

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a

Supplementary angles

b

Complementary angles

c

Adjacent angles

d

 Vertically opposite angles

answer is A.

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Detailed Solution

  • A pair of angles, which when added measure 180 degrees are called supplementary angles. 
  • For example, the angles 65° and 115° are supplementary angles as by adding them together we get 180 degrees. 
  • If we join these two supplementary angles, we get a straight line.
  • And the figure below is showing the supplementary angles.

example of supplementary angles

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Two angles whose sum is equal to 180° are called: