Find the volume of a cylinder whose

(i) r = 3.5 cm, h = 40 cm

(ii) r = 2.8 m, h = 15 m

Find the ratio between the total surface area of a cylinder to its curved surface area, given that its height and radius are 7.5 cm and 3.5 cm.

A cylindrical vessel, without lid, has to be tin-coated on its both sides. If the radius of the base is 70 cm and its height is 1.4 m, calculate the cost of tin-coating at the rate of Rs. 3.50 per 1000 cm².

Find the volume of a cylinder, if the diameter (d) of its base and its altitude (h) are :

(i) d = 21 cm, h = 10 cm

(ii) d = 7 m, h = 24 m

The area of the base of a right circular cylinder is 616 cm² and its height is 25 cm. Find the volume of the cylinder.