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Mathematics 12 Online
OpenStudy (anonymous):

A circular piece of metal measures radius 7 cm. Find its cost at the rate of Rs.20/- per square cm?

OpenStudy (anonymous):

since the cost is given for unit area i.e. 1 square cm..to find the total cost , you need to know the total area of the metal..its circular..so use the area of circle to find the total area..

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