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From a rectangular sheet of paper ABCD with AB=40CM and AD=28cm, a semi circular portion with BC as diameter is cut off. Find the area of the remaining paper. `(U s epi=(22)/7)`

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Area of remaining portion=area of ABCD-Area of semi circle
` =(l×b)−(21πr^2)`
`=(40×28)−21×722×14×14`
` =1120−308`
...
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