Question

a circular mirror of radius 21 cm is surrounded by a circular frame of width 3.5 cm. find the cost of making the frame at 1.50rs per cm​

Answer 1

Answer:

Area of mirror=πr^2=22/7*21*21=1386cm^2.

Area of frame=Area of whole figure-Area of mirror

=πR^2-1386

=22/7*(21+3.5)^2

=22/7*24.5*24.5

=1886.5-1386

=500.5cm^2

Cost of making the frame=500.5*1.5

=Rs.750.75

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