Hi!I have encountered a problem with this question.Please help ,i really need to know how to work out the solution. Thx

Lovely wrote:


Hi!I have encountered a problem with this question.Please help ,i really need to know how to work out the solution. Thx
Hi Lovely,

There is a faint line in the diagram, so draw this line to form a triangle. Draw another dotted line to divide the lower shaded region into two. Move both of them (shaded) to fill up the unshaded regions outside the triangle. Finally, you will have an unshaded triangle with base and height as 20 cm.

Area of unshaded area of the figure = 1/2 x 20cm x 20cm = 200 cm2

Answer is option (2)

Hi Chris,
Pls help to put my words into illustration to help Lovely to understand better.

Thks.

You can find this question on Page 57 of the onSponge P6 +hinkingMath book - Question number 8.

Note: The answer is the solution on the left 200cm2. For information, you can see the area of the shaded part 114cm2.