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The value of x
(sh.itjust.works)
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this post was submitted on 08 Oct 2024
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This is a standard way to draw geometric proofs, it's not at all unreasonable to assume straight lines and unrepresentative angles.
normally in a geometric proof, a right angle is a right angle
This was certainly not my experience in high school. An unlabelled angle could never be assumed. Only angles marked with a square could be taken as right angles.
guess you're right!