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7 September, 09:32

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

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  1. 7 September, 10:26
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    20 edges

    F=12, V=10

    V - E+F=2

    10-E+12=2

    -E+22=2

    -E=-20

    E=20
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