A polygon has 30 edges and 12 verties who many faces does it have ?
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by euler formula
f +v -e = 2
f + 12 -30 = 2
f = 2 - 12 + 30
f = 20
f +v -e = 2
f + 12 -30 = 2
f = 2 - 12 + 30
f = 20
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