Jawapan

Jawapan Paling Bijak!
2016-09-14T21:32:20+08:00
This is a very great TIMSS question. Requires very high thinking skill ;)

Divide the square by creating your own line from Q to S.
Now you have 2 triangles.

Now look at the ice cream shape (triangle + quadrant). You can calculate half of the shaded region by calculating this :

Sector area - triangle area = half of the shaded region area

Since it is a half, what you have to do next is to multiply it with 2.
So now let's begin with the calculation :

Area of half of the shaded region :
[ (90º/360º) × (22/7) × 14² ] - [ (1/2) × 14 × 14 ]
= 154 - 98
= 56mm²

∴ Total area of the shaded region :
= 2 × 56
= 112mm²
2 5 2