Platonic solids

[HowardKennitby]

Hi all

http://www.daviddarli...P/Platonic_solid.html

Can someone please explain why 2 tetrahedrons combined would not be included?

thanks

Howie

[bigbadmarty]

A platonic solid has the same number of faces meeting at each vertex .
A double tetrahedron has three faces meeting at the "top " and "bottom" , but only two around the "middle"

[bigbadmarty]

sorry 4 around the "middle" :)

[HowardKennitby]

Thanks for that, I shall sleep easily tonight.

[ChuckFickens]

SO they're not solids that don't have sex then?

[boxtops]

Maybe saving themselves for the "right one" :)

[jomifl]

Additionaly the platonic solids can contain a concentric sphere which touches the centre of each face, whereas a double tetrahedron cannot(?)