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primary 6 | Maths | Geometry
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Luis Tan
Luis Tan

primary 6 chevron_right Maths chevron_right Geometry chevron_right Singapore

I managed to solve a but I cannot solve b

Date Posted: 1 year ago
Views: 133
1 year ago
Let the unshaded area in between B and C be X.

A - B - C = A + X - B - C - X
= (A + X) - (B+C+X)

Notice that B+C+X is just the area of the square - area of a quarter circle.

To find A+X,

First draw a line from the top left corner of the square to the bottom right corner (cutting across A),to get two triangles.

½ x area of (A+X) = area of one quarter circle - area of one triangle.

so A+X is just twice of that.

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Phylicia Tong
Phylicia Tong's answer
192 answers (A Helpful Person)
Oops i didn't name e regions according to qn, so pls refer to pic in my solution.