Question

# Question 8 (i) 30 circular plates, each of radius 14 cm and thickness 3 cm are placed one above the another to form a cylinder solid. Find (i) The total surface area.

Solution

## Given, radius of a circular plate, r = 14 cm Thickness of the circular plate = 3 cm Thickness of 30 circular plates =30×3=90 cm 30 circular plates are placed one above the another to form a cylinder solid. Then, (i) Total surface area of the cylindrical solid so formed =2πr(h+r)=2×227×14(90+14) =44×2×104=9152 cm2 Hence, the total surface area of the cylinder solid is 9152 cm2.

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