Euler's formula is important because it relates famous constants, such as pi, zero, Euler's number 'e', and an imaginary number 'i' in one equation. The formula is (e raised to the i times pi) plus 1 equals 0.
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He discovered the all important Euler's Rule often referred to as Euler's Formula.
http://en.wikipedia.org/wiki/Euler_angles
It's about ponis and viagra.
There is one face on the base and 4 round the edge (from each bottom edge to the top vertex) giving 5 faces in all.There are 4 edges round the square base and one edge from each of the 4 vertices of the base to the top vertex, giving 8 edges in all.There are 4 vertices round the square base plus another one at the top, giving 5 vertices in all.As a check, this obeys Eulers formula: Faces + Vertices = Edges + 25 + 5 = 10 = 8 + 2
What is the formula for a triangular prism