find the area of shaded region
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area of shaded region=area of semicircle- area of trapezium =1/2Πr square-1/2h(a+b)
1/2×3.14×28×28-1/2×20[28+56]
1230.88-840=390.88 sq.cm
1/2×3.14×28×28-1/2×20[28+56]
1230.88-840=390.88 sq.cm
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