一題想了挺久才完成的圖形題

幻藍

看看誰懂XD
In the following trapezium , DC//AB , AC⊥CB , AC=CB , AB=BD
Find∠ABD

JOHNLAM17

唔識做ar...
宣佈放棄

dolphin_ice

Find ABD ge咩?
angle?

細薯

諗左1hour
暫時擱置一邊

JOHNLAM17

Originally posted by 紅唇娃 at 2005-4-17 01:00 AM:
Find ABD ge咩?
angle?

yes, 係搵angle...
好難ar=.=

抹茶可樂

提示：聯立一次

細薯

Originally posted by 落雷 at 2005-4-17 07:11 PM:
提示：聯立一次

聯立一次是甚麼﹖

JOHNLAM17

Originally posted by smallpotato226 at 2005-4-17 07:25 PM:

聯立一次是甚麼﹖

對呀
是什麼來的?
係咪方程式?
仲有, 中三程度識唔識做gar
===================================
搵到la
係simultanceous equations
但係咁又點??
===================================

[ Last edited by JOHNLAM17 on 2005-4-17 at 08:51 PM ]

oscar

唉....我的Geometry果然是差點....
我到現在都想不到....我哥哥(Form6讀P.Maths.)都不懂...

snoopy11hk

我就係計到

a+b+c+d=180
a+c=90
a+b=h
f=g+h
f=b-g-h
e+f+g+h=180
180-e=2g-2h
e=b
d=h
90=a+2b
2b=c
90-b=h



a= Ang. DBC
b= Ang. DBA
c= Ang. ACB
d= Ang. ACD
e= Ang. BDC
f= Ang. ADB
g= Ang. DAC
h= Ang. CAB