earrings EP metal plate as an internal radius of 7 cm and external radius of 10.5 CM the cost of material is rupees 5 per sq. Cm find the cost of 25 rings
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area of circle=pi(Rsquare-rsquare)
=22/7(10.5) square-(7)square
=22/7×110.25-49
=22/7×61.25
=22×8.75
=192.5cm sq
cost of material=5
then rate is 192.5×5=962.5
,then 25 material =25×962.5
=24062.5
=22/7(10.5) square-(7)square
=22/7×110.25-49
=22/7×61.25
=22×8.75
=192.5cm sq
cost of material=5
then rate is 192.5×5=962.5
,then 25 material =25×962.5
=24062.5
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