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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 B) 22 C) 25 D) 20

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oopsydaisy
Out of the choices given, the gemstones had approximately 20 edges. This correct answer is D, 20. The answer can be figured out by using " Euler's Polyhedral Formula." The correct formula for this particular question is shown here; F = 12, V = 10 V - E + F = 2 10 - E + 12 = 2 -E + 22 = 2 -E = -20 E = 20. I hope that helps you. 
ealzaba

Answer:

20 edges

Step-by-step explanation:

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