**30 circular plates, each of radius 14 cm and thickness 3 cm are placed one above the another to form a … (ii) volume of the…**

###### Answers:

Height of the cylinder formed (h) = 30 x 3 = 90 cm

Radius of the base of the cylinder formed (r) = 14 cm

(i) Total surface area of the cylinder = 2πr(r + h)

= 2 x 22/7 x 14(14 + 90)

= 2 x 22/7 x 14 x 104 = 9152 cm^{2}

(ii) Volume of the cylinder formed = πr^{2}h

= 22//7 x 14 x 14 x 90 = 55440 cm^{3}