Comment on To the center of the earth!📉

bjoern_tantau@swg-empire.de ⁨2⁩ ⁨months⁩ ago

• expatriado@lemmy.world ⁨2⁩ ⁨months⁩ ago

  correct, just commening the 100/80 intersection looks like 90/90, i think it was intentionally misleading, classic trying to get you problem

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  • Worx@lemmynsfw.com ⁨2⁩ ⁨months⁩ ago

    What a bunch of bullshit. Just draw it way off 90 if you don’t want people to use a protractor. I calculated 125° because of this (but I’m happy I still got the right wrong answer, if that makes sense)

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    • rockerface@lemm.ee ⁨2⁩ ⁨months⁩ ago

      In my geometry classes, it’s only 90 degrees if it’s marked by a right angle marker. Otherwise, no matter how “right” it looks, if you assume before proving, it’s on you.

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      • jdeath@lemm.ee ⁨2⁩ ⁨months⁩ ago

        this is a meme tho. i wanted to treat it like a “real life” problem where if i saw those obviously 90 degree corners, i would just say it’s 90 because nowhere else in all my life outside of stupid schoolwork trick questions would that happen. which meant i got to the answer in a few seconds, which is a handy skill in real life.

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    • 299792458ms@lemmy.zip ⁨2⁩ ⁨months⁩ ago

      Its not bulshit, its conventions that make a lot more whole sense later on.

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  • SendMePhotos@lemmy.world ⁨2⁩ ⁨months⁩ ago

    Yes I originally thought 90 but then noticed the absence of a right angle sign. Also 60+40=100 which means the last angle should be 80. Making that perpendicular 100/80

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• AcesFullOfKings@feddit.uk ⁨2⁩ ⁨months⁩ ago

  [deleted]

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  • Enkers@sh.itjust.works ⁨2⁩ ⁨months⁩ ago

    I’d get out my red pen and write: “Bad diagram. -1pt See me after class.”

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• slaacaa@lemmy.world ⁨2⁩ ⁨months⁩ ago

  Yes, simple doodle below for anyone wondering. You start from left, and calculate them 1 by 1, based on the angles that you already know. It is quite simple actually, you just have to know they always add up to 180 (within triangle, and when you “split” the space over a straight line).

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  • stebo02@lemmy.dbzer0.com ⁨2⁩ ⁨months⁩ ago

    you mean to say the right angles aren’t right angles? disgusting, get this outta my sight

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    • slaacaa@lemmy.world ⁨2⁩ ⁨months⁩ ago

      evil math teacher laughing in background

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    • spiffpitt@lemmy.world ⁨2⁩ ⁨months⁩ ago

      this diagram does not provide a right angle indicator, and thus should not be assumed as a right angle

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      • stebo02@lemmy.dbzer0.com ⁨2⁩ ⁨months⁩ ago

        yes that’s the stupid excuse my math teacher would give

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• Maalus@lemmy.world ⁨2⁩ ⁨months⁩ ago

  Nope. The value is “undefined”. You don’t have enough info to arrive at 135 - you are assuming that the bottom angle (sum of the angles that touch) is 180 degrees. Since there isn’t a datum saying the bottom “line” is straight, nor does it say the triangle on the right is an isosceles triangle, it is impossible to solve.

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  • gedaliyah@lemmy.world ⁨2⁩ ⁨months⁩ ago

    I don’t see any indication that this is limited to the Euclidean plane either

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    • BlueMagma@sh.itjust.works ⁨2⁩ ⁨months⁩ ago

      Haha, I love this.

      Also nothing indicates the numbers are Arabic numerals.

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      • gedaliyah@lemmy.world ⁨2⁩ ⁨months⁩ ago

        You can’t prove it’s not hexadecimal.

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  • bjoern_tantau@swg-empire.de ⁨2⁩ ⁨months⁩ ago

    Image

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  • Enkers@sh.itjust.works ⁨2⁩ ⁨months⁩ ago

    I think assuming 2 line segments which make up a larger straight line segment to be parallel is generally accepted practice, and that would trump the angles that are drawn inaccurately.

    Of course, it’d be better to put a hash through them both to indicate they’re parallel, especially given the deceptively drawn most-likely-not-a-right-angle.

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• lugal@sopuli.xyz ⁨2⁩ ⁨months⁩ ago

  For context: it used to be 675° a few years back so the math checks out.

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  • expatriado@lemmy.world ⁨2⁩ ⁨months⁩ ago

    that’s not how global warming works

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• ThisIsAManWhoKnowsHowToGling@lemmy.dbzer0.com ⁨2⁩ ⁨months⁩ ago

  I got 125.

  180-(90-35)=x 180-55=x 125=x

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  • LotrOrc@lemmy.world ⁨2⁩ ⁨months⁩ ago

    How assuming it is a right angle Nothing stays that it is

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    • shasta@lemm.ee ⁨2⁩ ⁨months⁩ ago

      Even if it was a right angle, I think a second assumption is that the top left and bottom lines are equal length, which is also not stated.

      I think there’s just not enough information in this picture to calculate the angle, and it can only be determined by measuring. But the image also does not specify that it is drawn to scale.

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    • ThisIsAManWhoKnowsHowToGling@lemmy.dbzer0.com ⁨2⁩ ⁨months⁩ ago

      Oh shit you’re right

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  • erin@lemmy.blahaj.zone ⁨2⁩ ⁨months⁩ ago

    It isn’t 90 degrees because the image is misleading. 60+40+y=180. y=80

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