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OpenStudy (anonymous):
One gemstone has 10 faces and 12 vertices. How many edges does the gemstone have? A) 20 B) 23 C) 25 D) 22
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OpenStudy (misssunshinexxoxo):
Euler's formula says number of faces plus number of vertices minus the number of edges equal 2.10+12-E=2; E=20 twenty edges.
OpenStudy (anonymous):
Thank you!
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