from a rectangular metal sheet of size 20 cm by 30 cm , a circular sheet as big as possible is cut .find the area of the remaining sheet.
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The maximum circle will have
a diameter = smallest side of rectangle
∴ diameter =20cm
Area remaining =(l×b)−(πr
2
)
=(30×20)−(π×(
2
20
)
2
)
=285.84cm
2
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