Oh look, there's the PMR thread. I was wondering where it was.

Science Form 3 has quite a lot of Physics related chapters in it. Not many Chemistry related chapters. Form 3 Sejarah is quite interesting in my opinion. As for Maths, watch out for Indices. I'm not trying to scare you but I had a little trouble understanding it two years ago.

I wanted to say that PMR is a very easy examination and there's nothing to worry about but it's no use, you guys are going to worry anyway. It's normal.

Don't study hard, study smart.

You must write the full sentence.

I understand what you're going through. My Form 4 Sejarah teacher also went for maternity leave.

However, you just got to suck it up and catch up if you want to score an A. Go ahead and attend the free tuition. You should sacrifice some time for your Sejarah.

Is the answer 8.379m?

---

Added on February 12, 2012, 10:38 pmIn order to find DC, you need to find angle COD.

Since PA=PB, angle PAO=angle PBO.
And if you look carefully, PAOB is a quadrilateral so it is is 360°
I shall name angle APB x. Hence, angle AOB is 2x.

30+30+x+(360-2x)=360
You will get the answer x=60°

angle COD = angle AOB = 2x = 120°

Then you just substitute the angle 120° and r = 4m into the LOA formula you learnt in Form 2.

*Crosses fingers and hope that I'm not wrong.

This post has been edited by blueflame: Feb 12 2012, 10:39 PM

It's 120/360 x 2 x 3.142 x 4

The formula of length of arc is 2 pi r.

For this subtopic, all you need to know is

1. The angle subtended anywhere at the circumference by the same arc is equal.
2. The angle subtended at the center is twice the angle subtended at the circumference provided it is by the same arc.
3. The angle subtended at the circumference by the diameter is always 90°

That's it. It's just that the questions can change here and there. I have to admit that it can be tricky. But if you do lots of exercises, you can get the hang of it.

And as for the circle terminologies, sorry, I can't explain it online. Try googling it.

---

Added on February 12, 2012, 11:32 pmAngle PQR = 180-56 = 124
Angle QRP = (180-124)/2 = 28
Angle PRS = 90
Angle QRS = 90+28 = 118
Angle QPS = 180-118 = 62


This post has been edited by blueflame: Feb 12 2012, 11:32 PM

I did my Sejarah and Geografi kerja kursus by myself, with the assistance of my teachers of course.

The topics in my year were very easy - Perayaan for Sejarah and Kitar Semula for Geografi.

Hello! Good luck for your PMR guys. My sister will be sitting for her PMR too. She seems pretty calm to me. haha.
All the best.