20 circular plates, each of radius 7 cm and thickness 1.5cm are placed one above the another to form a cylindrical solid. Find TSA and volume of cylinder so formed.
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Answer: 67912 ; 1540
Step-by-step explanation:
To find height we should multiply 20 with 1/2 as 20 plates which are placed one over the other have thickness of each1/2cm.
So,height=20*1/2=10
Total Surface Area Of A Cylinder = 2πrh+2πr^2 = 2*22/7*7*10+2*22/7*7^2 = 67912cm^2
Volume Of A Cylinder = πr^2 h = 22/7*7^2*10= 1540cm^3
Ashk432:
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wrong answer
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h=20×1.5= 30cm
r= 7cm
TSA of Cylinder = 2πrh +2πr^2
=============== 2πr(r+h)
===============2×22/7 ×7(7+30)
===============44×37
===============1628sq cm
TSA = 1628 sqcm
Volume of Cylinder
= πr^2h
=22/7 × 7×7 ×37
=5698 cubic cm
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r= 7cm
TSA of Cylinder = 2πrh +2πr^2
=============== 2πr(r+h)
===============2×22/7 ×7(7+30)
===============44×37
===============1628sq cm
TSA = 1628 sqcm
Volume of Cylinder
= πr^2h
=22/7 × 7×7 ×37
=5698 cubic cm
Happy New Year ☺️☺️☺️☺️☺️☺️
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