## Q&A - PSLE Math

### Re: Q&A - PSLE Math

Find the areas of the square, quadrant and semicircle first.Yerdua wrote:

Pls help with this 5marks qn. Thanks!

Square - quadrant + semicircle = 2x +(w+y) ...... Note (w+y) = 2x

Square - quadrant + semicircle = 4x

Area of x = 4x/4

The method used is to mapped the region w, x , y and z with the above areas

When you add the area of square, region w, x, y, and z is marked with 1.

Minus the area of quadrant. y and z becomes 0. While w and x remain as 1.

Add the semicircle, y becomes 1 and x becomes 2.

Final result is z is 0, w and y are 1 count each and x is 2 counts. I.e 2x + (w+y).

- Nebbermind
- KiasuGrandMaster
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### Re: Q&A - PSLE Math

SBA = ABE = (180 - 108)/2 = 36ozora wrote:Need some help in geometry thanks

BAE = 180 - (36 + 79)

CSA = AEB = 79

TSC = 90 - 79 = 11

SCT = BCD = 90 - 11 = 79

### Re: Q&A - PSLE Math

Thank uNebbermind wrote:SBA = ABE = (180 - 108)/2 = 36ozora wrote:Need some help in geometry thanks

BAE = 180 - (36 + 79)

CSA = AEB = 79

TSC = 90 - 79 = 11

SCT = BCD = 90 - 11 = 79