If in a polyhedron, number of faces = 20 and number edges = 30; the number of vertices is :
12
6
8
20
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Given:
F = 20, E = 30
According to Euler's formula,
F + V - E = 2
⇒ 20 + V - 30 = 2
⇒ V - 10 = 2
⇒ V = 2 + 10
⇒ V = 12
Hence, option 1 is the correct option.
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Draw two nets for the following polyhedron :
is the net of :
square pyramid
triangular prism
hexagonal pyramid
none of these
Joseph is making a pentagonal prism using identical straws. How many straws does he need ?
18
15
10
