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(a) Perimeter of the shaded area = 1/4 perimeter of big circle + 1/4 perimeter of small circle +2( 6 -4)  = 2 * 3.14 * 6 /4 + 2 * 3.14 * 4/4 + 4

= 19.7 cm

(b) Area of shaded area = 1/4 Area of big circle + 1/4 area of small circle – area of rectangle
= 3.14 * 6²/4 + 3.14* 4²/4 – 4 * 6

= 16.82 cm²

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