Question

(11. The radius of a circular brass plate is 20 cm.
Find the cost of polishing the
12 such plates at the rate of 450 per sq. m.
(Take it = 3.14)
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Answer 1

Answer:

area=πr^2

=3.14*(0.2)^2

=0.1256m^2

area of 12 plates=0.1256*12=1.5072m^2

cost of polishing 12 plates= 450*1.5072

=678.24 rupees