1 條Form 2 數.. 入黎啦``

2007-06-09 12:10 am

e 條數係要搵邊d 係similar triangle..
但係我唔知點寫式...
有冇人可以教下我點prove 呀?
我條問題upload 左去條link 到...
link: http://www1.filehost.to/files/2007-06-08_02/100753_Maths_15.bmp
thx~

回答 (6)

球棋

2007-06-09 12:21 am

✔ 最佳答案

答案係A,所以如果要証明triangleABD~triangleACB
首先
因為 angle ABD = angle ACB
angle BAC = angle CAB
咁睇triangleABD 同triangleACB
三角形內角有兩隻相同,第三隻一定係相同啦
So, angle ADB = angle ABC
因此兩個三角形內角三隻一樣就一定係相似三角形啦
所以triangleABD~triangleACB

👍 0 👎 0

123

2007-06-22 9:35 am

angle ABD=angle ACB (given)
angle BAC=angle BAD(same)
so angle ADB=angle ABC( sum of triangle)

so they are similar(A.A.A)

👍 0 👎 0