Hi, I'm Ai Ling Ong. I enjoy coaching students who have challenges with understanding and scoring in 'O' Level A-Maths and E-Maths.
I develop Math strategies, sometimes ridiculous ideas to help students in understanding abstract concepts the fast and memorable way.
I write this blog to share with you the stuff I teach in my class, the common mistakes my students made, the 'way' to think, analyze...
If you have found this blog post useful, please share it with your friends. I will really appreciate it! :)

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Lustrous Realmsays

You can form 2 equilateral triangles within the shaded region itself and the length of each side is 2r.

Next is to find the total area of these 2 triangles. You can use the equation half x base x height. The base is 2r and the height can be found with pythagoras theorem.

Since we know that there are 2 equilateral triangles, we will know that the angle is 120 degrees. Thus, find the area of the sector now using the formula half x radius squared x theta. The theta is 120 x pi divide 180.

Use this value to minus off the total area of the 2 equilateral triangles found earlier. Name this value x.

The answer can then be proven by the following expression:

2x + Total Area of the 2 equilateral triangles.

Good luck to you in your Prelims XD

Rachelsays

Well your question is not really that hard. There are question harder than that:P

waleedsays

can u show scanned working.........plus proving.

ahsan latifsays

good question but too much hard as it seems , by looking at it.
add some more question so that this shall help students.

Lustrous Realm says

You can form 2 equilateral triangles within the shaded region itself and the length of each side is 2r.

Next is to find the total area of these 2 triangles. You can use the equation half x base x height. The base is 2r and the height can be found with pythagoras theorem.

Since we know that there are 2 equilateral triangles, we will know that the angle is 120 degrees. Thus, find the area of the sector now using the formula half x radius squared x theta. The theta is 120 x pi divide 180.

Use this value to minus off the total area of the 2 equilateral triangles found earlier. Name this value x.

The answer can then be proven by the following expression:

2x + Total Area of the 2 equilateral triangles.

Good luck to you in your Prelims XD

Rachel says

Well your question is not really that hard. There are question harder than that:P

waleed says

can u show scanned working.........plus proving.

ahsan latif says

good question but too much hard as it seems , by looking at it.

add some more question so that this shall help students.

Loradae says

The truth just shines thurogh your post