Thursday, February 13, 2014

Mr Euler's formula

F + V - E = 2


This is the formula that Mr Euler came up with for 3D shapes.

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.


2 comments:

  1. It was fun making 3D shapes with polydrons! I remember my shape was called a hospindon.

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  2. Yes, the hospindon, a great name!

    If I remember rightly:

    9 Faces + 9 Vertices - 16 Edges = 2.

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