50 circular plates each of diameter 14 cm and thickness 0.5 cm are placed one above the other to form a right circular cylinder. Find its total surface area.
Diameter of each circular plate = 14 cm
∴ their radius, r = 7 cm
Thickness of each plate = 0.5 cm
50 plates are placed one above the other to form a right circular cylinder
∴ height of the cylinder formed, h = 50 × 0.5 cm
Or h = 25cm
Total surface area of the cylinder = 2πr(r + h)
= 1408 cm2
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