People Twitter

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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] 6 points 2 months ago* (last edited 2 months ago) (1 children)

Nah, the angle isn’t specified as a right angle. We can’t assume it’s 90° just because it’s drawn that way, because it isn’t drawn to scale.

Left triangle has 180° total. 60+40=100, which means that middle line is actually 80°, not 90. And since the opposite side is the inverse, we know it is 100° on the other side.

100+35=135. We know the right triangle also has 180° total, so to find the top corner we do 180-135=45. So that top corner of the right triangle is 45°, meaning x must be 135° on the opposite side.

[–] [email protected] 0 points 2 months ago

I mean, it's visibly an acute angle wether it's labelled as such or not.