f.3 area of volume

PS: detail steps are not going to be shown below
1) pyramid VACR ~ pyramid VDFE
ratio of VC to VF = 2 : 2:3 = 2:5
ratio of required area(tri ABC to tri DEF) = 2^2 : 5^2 = 4 : 25
2) Let V1 : V2 = 64:343
L1 : L2 = 3rt64 : 3rt343 = 4:7
A1:A2 = 4^2 : 7^2 = 16 : 49
V=volume, L=length, A=area

2008-06-08 14:22:23 補充：
Ans1) line 2

ratio of VC to VF = 2 : 2:3 = 2:5

should be ratio of VC to VF = 2 : 2+3 = 2:5