Question

Find the curved surface area of the cylindrical pole whose volume is 1.54 cubic metre

and diameter of base
is 140 cm (Need to find height first to find curved surface area). Also find the cost of whitewashing the curved surface area of pole at the rate of ₹ 325
per metre square.​

Answer 1

Answer:

Let h be the height of cylinder whose radius,

r= 140/2cm

=70cm= 70/100

m=0.7m

and volume =1.54m^3

.Now, volume =1.54cm^3

⇒πr ^2h =1.54

⇒ 22/7 ×0.7×0.7×h=1.54

⇒h= 1.54×7/22×0.7×0.7 =1

Hence, the height of the cylinder is 1m.