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a) The radius of the circle can be taken as 1 unit. Therefore, the ratio of the length to the breath of the rectangle will be 8 units : 4 units. The area is then 8 x 4 = 32 units

32 units = 288
1 unit = 9 cm
Total perimeter of the rectangle is 8 + 8 + 4 +4 = 24 units
24 units = 24 x 9 = 216 cm

b) All the semicircles and quadrants together make up 7 complete circles

Area of 7 circles = (22/7 x 9 x 9) x 7
= 1782 cm2

Area of shaded figure = Area of 7 circles + Area of rectangle
= 1782 + 288
= 2070 cm2

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