Question

a = Number of vertices of a tetrahedron
b = Number of edges of a tetrahedron
c = Number of faces of a tetrahedron
Find the value of a+b+c

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Answer 1

A tetrahedron is formed by the help of four planes as you can see in the figures .

A tetrahedron is composed of four triangular faces, six straight edges and four vertex corners
$\Rightarrow$ a+b+c = 4+6+4 = 14