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A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
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How do you know which one is "opposite" and adjacent? They could literally be exactly the same but in any case they both touch the hypotenuse?
Adjacent or opposite to the angle you're referring to.
So the picture is wrong then, the marked angle is top right (and the right angle, of course), the other angle is not marked, so adjacent and opposite are swapped.