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Using Euler’s formula find the unknown. ...

Using Euler’s formula find the unknown. Faces `?, 5, 20` , vectices `6, ?, 12` and Edges `12, 9, ?`

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Euler's Formula: F+V-E=2,
where, F= Faces, V= Vertices and E= Edges
(i) `F+6-12=2`
`F=2+6`
`F=8`
(ii) `5+V-9=2`
`V-4=2`
`V=6`
...
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