Singapore Primary School Mathematics - Geometry Part 2
Math Topic – Geometry
Primary 6 Level Question: The figure below shows a circle and 2 squares. Find the area of the shaded parts given that the length of the bigger square is 20 cm. ( Take π = 3.14)
Can you solve this problem? Scroll down.
When you rotate the inner square, the corners will meet the sides of the outer square.
Replacing the outer square with the same color - you'll notice that the area of the inner square is actually half the area of the outer square.
Another visual example:
Area of outer circle is 3.14 X 10 X 10 = 314 centimetres square.
Area of inner square is 1/2( 20 X 20 ) = 200 centimetres square.
Therefore area of shaded area is 314 - 200 = 114 centimetres square.
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Singapore Primary School Mathematics - Geometry Part 1 (What you need to know)
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