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OpenStudy (anonymous):
Use Euler's Formular to find the missing number. Vertices:13 Edges:28 Faces:?
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jimthompson5910 (jim_thompson5910):
The formula you need is V - E + F = 2
jimthompson5910 (jim_thompson5910):
In this case V = 13 E = 28 F = unknown
OpenStudy (anonymous):
13-28+17=2
jimthompson5910 (jim_thompson5910):
that is correct, so F = 17
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