Question

17. 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 rupees. 15 per cm²​

Answer 1

Answer:

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

Area of frame=Area of whole figure-Area of

mirror

=TTR^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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