Question

Please solve this question.

A cylindrical well is 21m deep. Its outer and inner diameters are 21m & 14m respectively. Find the cost of renovating the inner curved surface and outer curved surface at the rate of ₹25 per m².

And the answer is ₹57,750.

The best answer will be marked as brainliest..

Answer 1

inner curved radius =14/2=7m
inner curved surface area = 2πrh
= 2×22×7× 21/7
= 924 m^2
outer curved surface are = 2×22×10.5×21/7
= 1386 m^2


so cost = (924 + 1386)× 25 = 57,750 rs

Answer 2

curved surface area = 2πrh