SSC CHSL 9 Jan 2017 Shift 1 Paper

Question : 67 of 100

Marks: +1, -0

Dodecahedron has 30 edges. How many vertices does it have?

Solution:

Euler's formula : where V is number of vertices , F is number of faces and E is number of edges.
Dodecahedron has 30 edges and 12 faces.
⇒

V = 2 + E − F = 2 + 30 − 12

⇒

V = 32 − 12 = 20

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