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how do you find the value of a?

Trying to find the value of a in different angles? not sure if their complimentary or supplementary

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Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
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Hi Jeffrey;
Complimentary angles add-up to 90-degrees.
Supplementary angles add-up to 180-degrees.