The figure is made up of three circles and two semi-circles. O is the center of the circle. AB is 42 cm. Find the total area of the shaded part. 
Area of 1 square ----- (10.5 x 10.5)square cm = 110.25 square cm
Area of 2 squares ----- 2 x 110.5 square cm = 220.5 square cm
Area of shaded area is ---- Area of whole figure – area of 1 small circle – area of 4 small quadrants – area of 2 squares
(1386 - 346.5 - 346.5 - 220.5) square cm = 472.5 square cm
Answer: 472.5 square cm
Monday, September 07, 2009
Anglo Chinese School 2007 PSLE Math Prelim Q45
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