This is the formula that Mr Euler came up with for 3D shapes.
It means
Faces + Vertices - Edges = 2
It means
Faces + Vertices - Edges = 2
Today we tried it out. It was true for all the shapes we tried.
But Jacques and Clara came up with a shape it doesn't work for: the sphere. Here, 1 + 0 - 0 doesn't equal 2.
It was fun making 3D shapes with polydrons! I remember my shape was called a hospindon.
ReplyDeleteYes, the hospindon, a great name!
ReplyDeleteIf I remember rightly:
9 Faces + 9 Vertices - 16 Edges = 2.