iMath | Community

Jocelin Chua

Asked 9 years ago

SG Primary 5 Measurement

This one too

Replies 5

Jocelin Chua

The question is the last one

6 years ago

Jocelin Chua

6 years ago

Soo Vei Li

For Q4, the base of the triangle is not 18. Study the shaded triangle again and look for the correct length of the base.

6 years ago

Jocelin Chua

Ok...will do it now...tq

6 years ago

Soo Vei Li

For Q5, the areas of A and B are correct. But in the next step, would subtracting are of B from A result in the area of the polka-dotted triangle? Ask yourself -- how can you use the ratio given together with the areas of A and B to get the answer?

6 years ago

Jocelin Chua

Asked 9 years ago

SG Primary 5 Measurement

Is my method correct?

Replies 1

Soo Vei Li

First part 36 is correct. After that, 36x4? Re look at the figure and see if you understand what the question wants you to find and what shapes to add/subtract to find the required area.

6 years ago

Jennifer Cham

Asked 9 years ago

SG Primary 5 Measurement

Hi all, need help with this question. Thank you!

Replies 7

Raymond Ng

6 years ago

Guan Feng Lee

Wow so hard

6 years ago

Jason Oon

Raymond's answer is correct

6 years ago

Shira Shah

Care to explain Raymond Ng... kind of confuse

6 years ago

Raymond Ng

Basically, the method is to add up the 2 triangles 1st but by doing that, we've inadvertently double counted the overlapped region twice, so we need to subtract it once. A neat way to obtain the sum of the 2 triangles is to shift P downwards so that SPQ form a nice triangle. Note that the area remains unchanged by the shift. Hope this clarifies.

6 years ago