#find reference angle question 2

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undone pier
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i totally forgot how to find the reference angle help i know about the rules like tan=y/x, sin=y, cos=x as you can see as well as the converting to degrees and subtracting 270 from it as its in quadrant 3 but the answer i got is literally around .20 away from the actual answer which is 216.87 degrees and idk what i'm doing wrong

supple pierBOT