Question

50 circular plates each of diameter 14cm and thickness 0.5cm  are placed one above other to form a right circular cylinder. Find its total surface area?

Answer 1

Given that 50 circular plates each with diameter = 14cm

Radius of circular plates (r) = 7cm

Thickness of plates= 0.5

Since these plates are placed one above other so total thickness of plates = 0. 5 x 50

= 25cm.

Total surface area of acylinder = 2πrh + 2πr²

= 2πrh + 2πr²

= 2πr (h+r)

= 2 x 22/7 x 7(25+7)

T.S.A = 1408cm²

∴Total surface area of circular plates is  1408cm²