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The value of x (sh.itjust.works)

submitted 2 months ago by [email protected] to c/[email protected]

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[–] [email protected] 10 points 2 months ago (1 children)

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

[–] [email protected] 11 points 2 months ago (1 children)

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

[–] [email protected] 1 points 2 months ago (1 children)

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

[–] [email protected] 17 points 2 months ago (1 children)

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.

[–] [email protected] 2 points 2 months ago

guess you're right!