1). By Euler Rule. F + V - E = 2.
Now F=16, V=20, therefore, E= F + V -2 = 16 + 20 - 2 = 34.
2) For Prism, Face = 12. Edge = 10 x 2 = 20.
3) For pyramid, Edge = 10, Base edge = 10/2 = 5.
2008-07-15 13:56:41 補充:
Correction: Q.2 answer should be 10 x 3 = 30.