# How many faces does a sphere have?

Discussion in 'Primary' started by chocciemad, Feb 1, 2011.

Hi everyone, sorry for sounding ignorant but I am doing my homework before teaching 3d shape tomorrow to my Year1's. Can you tell me how many faces a sphere has as the internet keeps telling me different things!

Thnaks

2. ### impulce

One!

Thanks impulce that is what I thought but wanted to be sure!

None, it has a surface but not a face!

5. ### harchie

not as many faces as my ex headteacher!

6. ### shalteir

www.numeracysoftware.com has a good page on the properties of 3-D shapes.

7. ### RossJ1

A Sphere has no faces.
According to the QCA definition, a face is the flat surface on a shape.
It may be possible to suggest that a sphere has 1 curved face but as 'face' means flat surface then it clearly has none.

8. ### minnieminxNew commenter

But then would you also say a cylinder has only two faces?

9. ### nosandals

There's a KS1 past sats paper where you sort 3D shapes according to the number of faces, and the correct answer on that is that a sphere has one face. So I'd go with that.

10. ### coffeecakesNew commenter

I was always taught that a circle has an infinite number of sides (as a perfect circle is impossible) - not one. So I would use the same logic to suggest that a sphere has an infinite number of faces.

11. ### mystery10Occasional commenter

Yes - think about a regular polygon, the more sides it has the closer and closer you get to a circle. There are interactive whiteboard demos of this. Same equivalent for a sphere. KS1 shape stuff is wrong in lots of different ways. It might be best if they just left it at this is a triangle, this is a square, this is an oblong, this is a triangle, and here are the 3d equivalents and did the rest later!!

12. ### spindrift

A sphere has no faces.As someone has already said it has one curved surface.
A cylinder has 3 faces (2 circular, 1 rectangular)

13. ### brookey1970New commenter

Sorry to hijack but, on a related note: is a cylinder a prism?

14. ### FAIRYDELLNew commenter

Yes, see above post.

15. ### mystery10Occasional commenter

Spindrift kind of yes and kind of no. The more interesting way of thinking about it is to imagine a regular polyhedron, imagine the number of sides increasing and increasing ........ it would be tending towards a sphere. But yes for KS1 and KS2 the one curved surface idea is the correct answer - but it does stop the thinking about something way more interesting.
Yep a cylinder is a prism as wherever you chop it through transversely the cross-section stays the same..... oh and a cone could be viewed as a type of pyramid ...........