Question

7. The diameter of a circular well is 4.5 m and its depth is 7 m. Find the cost of cementing a the inner curved surface of the well at the rate of 7 3.50 per m2.



Please say in copy​

Answer 1

given 4 .5m diameter

to find circumference 2πr

4.5m \2 = 2.25m

$2 \times \frac{22}{7} \times 2.25$

$2 \times \frac{49.5}{7}$

99/7= 14.14m

to find cost 7*14.14

99m *73.50=₹ 7276.5