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標題: F.3 Similar Figure Question x3(中2做幾多就做幾多唔使做晒) [打印本頁]

作者: billyconan 時間: 10-1-30 10:11 PM 標題: F.3 Similar Figure Question x3(中2做幾多就做幾多唔使做晒)

[ 本帖最後由 billyconan 於 10-1-31 02:34 PM 編輯 ]

作者: YSC 時間: 10-2-5 12:20 PM

AF:FD:DB= 2:2:1
(跳了証3個3角形是相似)
AF:AD:AB=2:4:5

area of AFG:ADE:ABC= 4:16:25

area of FDEG : area of DBCE = 16-4: 25-16 = 12:9= 4:3

作者: YSC 時間: 10-2-5 12:28 PM

2a)

VC:CF = 2:1
VC:VF = 2:3

Area : area = (lenght )^2 : (lenght)^2
= 4 : 9
ratio area of ABCDEF : 9-4=5
so 4 : 5

作者: YSC 時間: 10-2-5 12:33 PM

3:
ratio of fishs lenght 6 : 12 = 1:2
ratio of fishs volume : 1:8

rise level = 0.8 / (1+8) X 8
= 6.4 /9 = 0.711cm

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