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The value of x (sh.itjust.works)
submitted 3 months ago by sjmarf@sh.itjust.works to c/whitepeopletwitter@sh.itjust.works
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[-] switchboard_pete@fedia.io 10 points 3 months ago

the answers here assume that the base is a continuous, straight line

given one of the angles on the left triangle is a right angle on the diagram, but 80 if you calculate it, you can't assume that

[-] brisk@aussie.zone 11 points 3 months ago

This is a standard way to draw geometric proofs, it's not at all unreasonable to assume straight lines and unrepresentative angles.

[-] switchboard_pete@fedia.io 1 points 3 months ago

normally in a geometric proof, a right angle is a right angle

[-] brisk@aussie.zone 17 points 3 months ago

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.

[-] MeThisGuy@feddit.nl 2 points 3 months ago

guess you're right!

this post was submitted on 08 Oct 2024
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