• Zagorath@aussie.zone
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    1 month ago

    Does this even meet the criteria for “a shape”? I’d have thought you need to be able to travel from any point within the shape to any other point, without crossing a line.

    • saltesc@lemmy.world
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      1 month ago

      The part showing the angle is not part of it. They should’ve made it a dotted line or something.

      Though, two of the 90° angles are.actually 270.

    • lunarul@lemmy.world
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      1 month ago

      That sounds like the definition for convex shape, not the general definition for a shape

        • lunarul@lemmy.world
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          1 month ago

          If you’re talking about straight lines, then yes, that’s how you define a convex shape. If any uninterrupted path can be taken, then the OP shape does satisfy the condition.

          Edit: just read the other comments and I see the problem was that you thought the internal angle shown for reference on how the shape was built is part of the shape. It’s not, just the thicker lines define the shape shown. The little crossmarks that show equal sides are also not part of the shape.

    • Bertuccio@lemmy.world
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      1 month ago

      I couldn’t find any definition of geometric shape that uses that criterion, including Wikipedia which also has a 5-pointed star shown with 5 line segments labelled as a shape: https://en.m.wikipedia.org/wiki/Shape.

      The meme is wrong because squares are polygons by definition, which by definition are made of line segments, but this thing has curved sections.