1120

The value of x
(sh.itjust.works)

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this post was submitted on 08 Oct 2024
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64 points4 weeks agoAll these people saying its 135 are making big assumptions that I think is incorrect. There’s one triangle (the left one) that has the angles 40, 60,

80. The 80 degrees is calculated based on the other angles. What's very important is the fact that these triangles appear to have a shared 90 degree corner, but that is not the case based on what we just calculated. This means the image is not to scale and we must not make any visual assumptions. So that means we can’t figure out the angles of the right triangle since we only have information of 1 angle (the other can’t be figured out since we can’t assume its actually aligned at the bottom since the graph is now obviously not to scale).Someone correct me if I'm wrong.

7 points4 weeks agoStupid stuff like this is why kids hate math class. Unless the problem says calculate

allunmarked angles, those visually 90 degree angles are 90 degrees. It works that way in any non engineering job that uses angles because it's common sense.14 points4 weeks ago* (last edited 4 weeks ago)...what? I get that this drawing is very dysfunctional, but are you going to argue that a triangle within a plane can have a sum of angles of 190°?

15 points4 weeks agoNope I'm not saying that. I'm saying this is a gotcha question that demotivates learners.

8 points4 weeks agoI see. I agree completely. The only place this belongs is as a thought experiment on making assumptions in geometry.

2 points4 weeks agoThe sum of the angles of a triangle are always

180°4 points4 weeks agoYes, I believe I implied this by suggesting that the sum of angles being 190° is absurd.

0 points4 weeks agoNo, they're saying that unless you're already good at this stuff, it's easy to assume that a visually 90° angle is actually 90° even when it's not

1 points3 weeks agoEspecially if you are bad at this stuff you know that drawing anything like that accurately is a real pain and nobody who can avoid it will ever do it to represent anything accurately. That is what labels are for.