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20 October, 12:45

Angles A and B are supplementary. If m ∠ A = 45°, find m ∠ B .

A. 45°

B. 145°

C. 135°

D. 15°

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Answers (2)
  1. 20 October, 14:53
    0
    Supplementary means they add to 180

    a+b=180

    a=45

    45+b=180

    minus 45 both sides

    b=135

    answer is C
  2. 20 October, 16:41
    0
    If Angles are supplementary, means they both add up to 180 degrees.

    A + B = 180°

    45 + B = 180°

    B = 180° - 45°

    B = 135°

    Option C.
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