Question
Using Euler's formula, find the unknown. [4 MARKS]
Faces?520Vertices6?12Edges129?
Answer: Option A
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Formula: 1 Mark
Application: 1 Mark each
Euler's formula = F + V - E = 2
⇒ F + 6 - 12 = 2
F - 6 = 2
F = 8
⇒ 5 + V - 9 = 2
V - 4 = 2
V = 6
⇒ 20 + 12 - E = 2
32 - 2 = E
E = 30
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