Science Memes

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Square! (lemmy.zip)

submitted 1 month ago by [email protected] to c/[email protected]

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[–] [email protected] 1 points 1 month ago (1 children)

Uhh, no. A crescent is a classic concave shape, but you can travel from any point to any other in a crescent without crossing a line, because it’s a single enclosed shape.

[–] davidagain 2 points 1 month ago (1 children)

A crescent isn't a convex shape though, and ironically you left out the word 'straight' in your rule about convex.

[–] [email protected] 2 points 1 month ago (1 children)

No irony, I didn't say straight because I didn't mean straight. I meant exactly what I said: you can get from one point to another without crossing a line. Because if you have to cross a line, you've either moved into a different shape (in the case of two adjoining shapes) or moves into empty space.

[–] davidagain 1 points 1 month ago

That's path connectedness. Convex shapes are ones in which any two points can be joined by a straight line internal to the shape.