Faces + Vertices= Edges + 2
F+V=E+2
For a polyhedron, count up all the faces, vertices, and edges and substitute in formula. If both sides of the equation aren't equal, Euler's formula is not verified for the polyhedron.
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Euler published the formula, which relates complex exponentials to trigonometric functions in 1748. See related link.
formula
BeCl2 is the molecular formula for beryllium chloride. The geometry of the chemical compound is linear and it is also nonpolar.
quadratic formula is used often
Eulers number Approx x^2.31