Answer:
Here: Number of vertices (V) =20 Number of edges (E) =30 Let the number of faces =F Then using Euler?s formula, we have F+V=E+2 ?..(1) \[\therefore \]Substituting the values of V and E in(1) ,we get F+20=30+2 \[\Rightarrow \] F +20=32 \[\Rightarrow \] F\[=32-20\] \[\Rightarrow \] F=12 Thus, the required number of faces=12.
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