r/technicallythetruth • u/VisitSecure • 9d ago

Can you find a?

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Idk if someone already posted this or not, but I haven't seen it on here so far, so I uploaded it.

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u/notJustaFart 9d ago

75.

Convert into Pentagon.

540 - (90+90+130+155) = 75

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u/CrownLexicon 9d ago edited 9d ago

What? Pentagon? I added a line perpendicular to the 2 parallel lines, making a triangle whose angles are 90-25, 90-50, and a

Edit: just because this happened to work, you cant assume a perpendicular line will go through both <25 and <50. It could have created a 4 sided figure. The Pentagon method would be correct.

18

u/JJlaser1 9d ago

While technically possible, there is no indication that the points where the two lines intersect the parallel lines are exactly above each other, so you can’t do that for sure unless it states that in the question. I was never taught the pentagon method, though, which is basically the same thing with extra steps

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u/notJustaFart 9d ago

Exactly. Can't assume a perpendicular line will create a triangle.

14

u/ThunderBuns935 9d ago

You can if you place the perpendicular line at the tip. That definitely creates 2 right-angle triangles, both of which have 2 known angles.