25 circular plates, each of radius 10.5 cm and thickness 1.6 cm, are placed one above the other to form a solid circular cylinder. Find the curved surface area and the volume of the cylinder so formed.
Radius of each circular plate = 10.5 cm
Thickness of each plate = 1.6 cm
25 plates are placed one above the other to form a solid circular cylinder
∴ height of the cylinder formed, h = 25 × 1.6 cm = 40cm
Total curved surface area of the cylinder = 2πrh
= 2640 cm2
Volume of cylinder = π r2 h
= π (10.5)2 × 40
= 13860 cm3
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