20 circular plates each of radius 7cm and thickness 1.5 cm are placed one above the other to form a solid right circular cylinder.find the total surface area of the cylinder so formed
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Solution:-
To find the height of the solid right circular cylinder, we have to multiply 20 by the thickness of the plate.
Height of the cylinder = 20*1.5
Height = 30 cm
Now,
Total surface area of the cylinder = 2πrh + 2πr²
⇒ 2*22/7*7*30 + 2*22/7*7*7
⇒1320 + 308
Total surface area of the cylinder = 1628 cm²
Answer.
To find the height of the solid right circular cylinder, we have to multiply 20 by the thickness of the plate.
Height of the cylinder = 20*1.5
Height = 30 cm
Now,
Total surface area of the cylinder = 2πrh + 2πr²
⇒ 2*22/7*7*30 + 2*22/7*7*7
⇒1320 + 308
Total surface area of the cylinder = 1628 cm²
Answer.
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