Question

find the cost of plastering a well of diameter 2.14m. and depth 14m at the rate of ₹5 per sq. m??​

Answer 1

$tsa = 2 \times \pi \times r \times h$

= 22 x 7 x 2.14/2 x 10

= 47.08sq.m

= 47.08 x 5

= rs 235.4