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I don't understand this, HELPP

I don't understand this, HELPP-example-1
User Brisbe
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1 Answer

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90-x = the complement
180-x = the supplement.

So on the second column, the 50° is actually correct, but the 90° isn't, because that should be 180-50 = 130° (alternatively you could just add 90 to the complement to get the supplement)
User Simiil
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