**Q1** : If the two vertices of a triangle are (3,-1) and (-2,3) and its orthocentre is the origin, find the coordinates of the third vertex.

**Q2** : Find the length of perpendicular drawn from (2,-1) on the line 3x+4y=12.

**Q3** : Deduce the length of the perpendicular for the point (x1,y1) on the line ax+by+c=0. Given that (0,-c/b) is on Y-axis while (-c/a,0) is on x-axis. (Hint : using area of triangle to obtain the result).

**Prizes** : The person who can get the answers correctly in the fastest of time will win a variety of red packets.

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oh,

i give up! >.<

Sir,examples 3 Q.8&9 can’t figure out!

when can can u solve it?

the rest questions really make me feel like to give up!

Sir, i feel that my math become worse now!

pressure~ ><

I gave Q8(i) as an example this morning. Many still don’t understand the meaning of 1) incentre of a triangle 2) equation of the angle bisector…

for Q9:

step 1: sketch a simple graph for 3 vertices of a triangle ABC

step 2: find the equation of AC

step 3: find the equation of AB

step 4: use the formula for two (+,-) for the angle bisector equations

step 5: determine which one is a positive gradient and the answer!

I think if i give you test (2) tomorrow u may ??? (^v^)…

老师，Q8(ii)还没有解喔！我试过去解，可是很奇怪，bisector算出来会有+-两个，但是一个没有x，一个没有y，那怎么取gradient？好奇怪啊！而且我看来看去还是看不出我错在哪里！！@@

老师，剩两个星期就期考了，如果你要赶课不能一题一题解，你把答案放上来给我参考，不是步骤哦！我知道算的步骤，可是算出来的equations每次都怪怪的，不懂是我+-不分还是题目故意考倒我~

所以麻烦你，解的时候把数据直接放上吧！^.^

你放心，我不会直接用抄的！我会看到明白才抄^^

谢谢你哦~再不然，你要是怕大家都上来抄答案没有自己做，那你email给我也ok!

The reasons I don’t want to publish the solutions or notes here are:

1. I have a scanner but I haven’t connected it to my PC yet! (This is the fastest way to publish many solutions to Ex. and many other notes)

2. I don’t like to use the rapid-pi to type any notes and solutions because it takes too long to do these!

Rapid-pi : this is a maths software to type all symbols and equations.