Geometry (check)

Mario’s company makes unusually shaped imitation gemstones. One gemstone had 12 faces and 10 vertices. How many edges did the gemstone have?

A. 23 edges
B. 22 edges
C. 25 edges
D. 20 edges****

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  1. You are correct, it is D

    F = 12, V = 10
    V - E + F = 2
    10 - E + 12 = 2
    -E + 22 = 2
    -E = -20
    E = 20

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  2. Thank you

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  3. thanks for the help

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