Question

Find? the answer by users formula
 
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Answer 1

Answer:

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.

Answer 2

Answer:

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