It never states in the question that the whole angle is 90
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I didn’t answer the original question, but my guess is that the person who answered made an assumption so that a solution could be given. The only other simple angle would be if ABC was a straight line so angle ABC would have been 180, making 8x=170, and x=21.25. But that doesn’t look cool, so they went for ABC=90 instead, and x=10 looks like a cool answer.

by Top Rated User (762k points)

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