in a handkerchief of diameter 40cm there is a border of 2 cm find the area of the border
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area of border= area of larger circle -area of smaller circle
=22/7×22×22-22/7×20×20
=22/7(22×22-20×20)
=22/7(484-400)
=22/7(84)
=22×12
=264cm^2
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