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16 May, 14:25

The measure of an angle is 51°.

What is the measure of its supplement?

A.

39°

B.

49°

C.

129°

D.

139°

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Answers (2)
  1. 16 May, 14:51
    0
    Here you need to know that supplement is Equal to 180

    Here how u would do it

    51 + x=180

    solve for x

    x=180 - 51

    x = 129

    So c is the answer to your question
  2. 16 May, 16:49
    0
    Supplement of an angle is what must be added to that angle to get 180

    51+supplement=180

    minus 51 both sides

    supplement=129

    answer is C
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