AriellaBrown7
Answered

GEOMETRY. PLEASE CHECK MY ANSWER! THANKS.

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

A23 edges
B22 edges
C25 edges
D20 edges****

Verified Answer :

I'd solved it in the pic, and the answer is D. 20

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penfila11Pen

This is simple.
we should have a knowledge of the Euler's Theorem/Euler's Formula
F+V=E+2
Basically states that:
# of Faces+ # of Vertices= # of Edges+2
12 + 10 = E + 2
(-2) + 22 = E + 2 (-2)
           20 = E

Yep, The answer is D. 20 edges

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