# Talk

## What's a 3 dimentional egg shape called please? For dd2 to get a merit!

(14 Posts)
Orinoco Wed 15-Oct-08 17:55:51

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nell12 Wed 15-Oct-08 17:57:40

ovoid

Raindog Wed 15-Oct-08 17:57:54

oval? ovoid?

Raindog Wed 15-Oct-08 17:58:41

From Wikipedia:
In common speech 'oval' means a shape rather like an egg or an ellipse, and it may be two-dimensional or three-dimensional.

fruitful Wed 15-Oct-08 17:59:01

Surely a 3D egg-shape is an egg?

TheDevilWearsPrimark Wed 15-Oct-08 17:59:34

lol I was about to say egg too

PortAndDemon Wed 15-Oct-08 18:00:47

Or a spheroid (means "a bit like a sphere, but not exactly"). A spheroid is to a sphere as a cuboid is to a cube (if they've covered cuboids, that should make more sense to her).

Orinoco Wed 15-Oct-08 18:01:51

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spammythevampireslayer Wed 15-Oct-08 18:01:53

I would have also said ovoid.

MrVibrating Wed 15-Oct-08 19:55:56

Hmmm...

Sphereoid is a technical term and it does not mean 'a bit like a sphere'. It means the surface obtained by rotating an ellipse. Sphereoids don't have one pointy end and one round end (although they can have two pointy ends like a rugby ball). They are a special case of ellipsoid.

Ellipsoids in general cannot be obtained by rotating any 2-dimensional curve: think of a rugby ball that has been sat on, or an orange squeezed at the sides.

That just leaves ovoid, which is an adjective meaning 'egg-shaped'. However, this can refer to both a 2-dimensional or 3-dimensional egg shape.

Sorry to be so pedantic, and for year 1 all this is way over the top, but ellipsoid and spheroid are simply wrong. If the teacher says something different send them round here for an argument .

Orinoco Wed 15-Oct-08 20:33:22

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myredcardigan Wed 15-Oct-08 20:44:20

Ovoid would be technically correct but I would be telling a Y1 child that a 3D egg shape was an egg. I would never describe a 2Dshape as an egg because that would confuse them as they would be visualing a 3Dshape if that makes sense.

Orinoco Wed 15-Oct-08 21:02:03

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shergar Fri 17-Oct-08 10:56:02

Definitely ovoid for the 3-dimensional shape.

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