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प्रश्न
Using Euler’s formula, find the value of unknown r in the following table.
| Faces | 8 |
| Vertices | 11 |
| Edges | r |
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उत्तर
By using Euler’s formula for polyhedron
From, F = 8, V = 11 and E = r
So, F + V – E = 2
⇒ 8 + 11 – r = 2
⇒ 19 – r = 2
⇒ r = 19 – 2
⇒ r = 17
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