Find? the answer by users formula
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Euler's formula, Either of two important mathematical theorems of Leonhard Euler. ... It is written F + V = E + 2, where F is the number of faces, V the number of vertices, and E the number of edges. A cube, for example, has 6 faces, 8 vertices, and 12 edges, and satisfies this formula.
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total Faces is 20 so
I.e 15+ 5=20
Total vertices is 12 so
I.e 6+6= 12
Total Edges is .....
I.e 12+ 9 = 21
21 is edges
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