Answer :

The given figure is a prism. The 2-D diagram of prism is as shown below:

Here given,

Edges, E = 30

Faces, F = 12

To find: Vertices, V

By Euler’s Formula,

F + V – E = 2

12 – 30 + V = 2

V – 18 = 2

V = 2 + 18

∴ Vertices, V = 20

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