2絛maths諗爆頭

AB^2=BD^2+AD^2(Pyth.theorem)

CD^2+AD^2=AC^2(Pyth.theorem)
CD^2..........=AC^2-AD^2

AB^2+CD^2
BD^2+AD^2+AC^2-AD^2
AC^2+BD^2


2010-07-16 14:49:29 補充：
Q2 is very easy

2010-07-16 15:02:15 補充：
Q1:
height=12

8^2+8^2=y^2
y.........=8sqrt2


(8sqrt2)/2
=4sqrt2
_______________________
(4sqrt2)^2+12^2=x^2
x.....................=4sqrt11
________________________

見唔倒圖..................