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post-17480-1

If you cut the square into half, it is made of 2 triangles with base =2R and height =R

R is the radius.

Area of one of the triangle = 98/2 = 49 cm2

1/2 (2R) .R = 49 cm2

R2 = 49

R =7 cm

Area of circle = 22/7 X 7 X7 = 154 cm2

Shaded parts = 154 -98 = 60   56cm2

 

Edit note: careless mistake with the calculator. Correction made. Answer is 56 cm2 and not 60.

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I really like your lateral thinking skills.  I would have tried to square root the square and get into all kinds of trouble!

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Thanks, but this is actually how the P5 and P6 are taught. I learned this just two years ago when I began coaching my son for P5 til PSLE.. I have to in a way ‘relearn’ primary school math to be in line with MOE syllabus. His math teacher helps too, she pointed his mistakes out and I make sure his follows thru with her correction. In fact I started out posting some P5 questions here then, and learn from the experts here.

Else, I would like you solve it with brute force. Square root to get the sides of the square too..

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I’m just glad to get to learn from you and other contributors.  Actually P6 maths is pretty good at stopping me from getting senile.  Keeps our minds sharp!  🙂

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