Question

The inner radius of a circular tunnel is 9 m and it is 21 m long . Find the cost of panting the inner surface of the tunnel at the rate of ₹ 8 per meter square.​

Answer 1

Answer:

9504 rs

Step-by-step explanation:

r equals 9 m and height equals 21 m

so, Curved surface area of the circular tunnel = the area needed for painting

csa of cylinder =2 pie rh

2×22÷7×9×21

1188

since its 8 metre per square

1188 ×8

9504 rs