Supplementary angles add to be 180 degrees. If one angle is 20. The supplement angle is 160.
180 - 20 = 160
160 is your answer.
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An acute angle has a smaller measure than an obtuse angle
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Giving out answers for a free test is something wrong but something I can help is to go review or I can help you review because algebra 1 is one easy of a topic when you really hook yourself to it.