switchboard_pete comments on The value of x

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[–] switchboard_pete@fedia.io 10 points 2 years ago (4 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

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[–] brisk@aussie.zone 11 points 2 years ago (3 children)

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

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[–] switchboard_pete@fedia.io 1 point 2 years ago (2 children)

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

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[–] brisk@aussie.zone 17 points 2 years ago (1 child)

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.

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[–] MeThisGuy@feddit.nl 2 points 2 years ago

guess you're right!

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