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 15rs per cm2
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radius of the circular mirror = 21 cm
area of the circular mirror = 22/7*21*21 = 1342 cm^2
if the radius is increased by 3.5 cm = 21+3.5 = 24.5 cm
new area = 22/7*24.5*24.5 = 1884.78 cm^2
area between the frame and mirror = 1884.78 - 1342 =
542.78 cm^2
therefore the cost = 15 * 542.78 = 8141.7 rs
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