this post was submitted on 19 Jan 2024
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[–] Sludgeyy@lemmy.world 27 points 1 year ago (2 children)

A square is a rectangle, but a rectangle isn't necessarily a square

Same with rhombus and diamond

A rhombus is a diamond, but a diamond isn't necessarily a rhombus

Rhombus has to have four equal sides, a diamond does not.

[–] hydrospanner@lemmy.world 12 points 1 year ago (2 children)

I think most people would say a 2D shape that they'd call a diamond would have 4 equal sides.

I don't think very many at all would call an elongated parallelogram a "diamond".

[–] Sludgeyy@lemmy.world 4 points 1 year ago (2 children)

If I took a traditional diamond shape and elongated just the bottom sides.

I feel like most would call it a diamond still. Specific term would be a kite. Many wouldn't come up with that, though. It's not an elongated parallelogram. It is not a rhombus.

"Diamonds" on bicycle playing cards have curved edges. They are not a rhombus because sides are not parallel. Most agree that it's the classic diamond shape, though.

[–] hydrospanner@lemmy.world 4 points 1 year ago (1 children)

If you give someone paper and a pencil and ask them, "Please draw a diamond shape."

Most will draw a 4 sided shape with 4 equal sides.

[–] Sludgeyy@lemmy.world 0 points 1 year ago

People would definitely want to elongate the top and bottom sides because they do not want to draw a sideways square, which is a rhombus, parallelogram, diamond too.

There's no way a human is going to draw 4 equal lines

No one at the end is going to be like "yeah but you have to be sure all sides are equal" when they have some kind of weird kite shape.

There's people out there that wouldn't count a sideways square as a diamond

Kites have 2 edges the same length, as do trapezoids, but they aren't touching. A Rhombus has 4 equal edges.

[–] Kusimulkku@lemm.ee 1 points 1 year ago (1 children)

For me the shape I was thinking of was if you take a simplified 2D version of this 💎, with there being 4 sides, 2 pairs of equal sides but not 4 equal sides

I imagine what people are talking about here is this ♦️ sort of diamond.

I blame me not being a native speaker for thinking of diamon diamond

[–] hydrospanner@lemmy.world 4 points 1 year ago (1 children)

That shape in 2D has five sides though.

[–] Kusimulkku@lemm.ee 0 points 1 year ago

True, I didn't pay enough attention but I though the two upper sides touched each others at the top, so it would have just 4 sides

[–] dudinax@programming.dev 4 points 1 year ago (3 children)

In practice, diamonds have equal sides.

[–] lolcatnip@reddthat.com 17 points 1 year ago (2 children)

In practice, diamonds are rocks.

[–] Honytawk@lemmy.zip 15 points 1 year ago

They're not rocks. They're minerals, Marie

[–] dudinax@programming.dev -1 points 1 year ago

In practice, diamonds are dirt paths with rubber vertices.

[–] faceula@lemmy.world 2 points 1 year ago (1 children)
[–] dudinax@programming.dev 3 points 1 year ago

When most people draw a "diamond" shape, they draw it with equal sides.

[–] Kusimulkku@lemm.ee 2 points 1 year ago

💎 what I'm thinking

♦️what I imagine is meant by diamond here