Draw two nets for the following polyhedron :

If in a polyhedron, number of faces = 20 and number edges = 30; the number of vertices is :

1. 12

2. 6

3. 8

4. 20

Joseph is making a pentagonal prism using identical straws. How many straws does he need ?

1. 20

2. 18

3. 15

4. 10

In case of a hexagonal pyramid, F = no. of faces and V = no. of vertices, then F + V is:

1. 10

2. 12

3. 14

4. 16