Find the curved surface area, total surface area, and volume of a cylinder with radius 20 cm and
height 42 cm.
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Answers
Answer:
A. = 2πrh+2πr2
= 2·π·20·42+2·π·202
= 7791.14978cm²
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Given
Radius of Cyclinder=20cm
Height of cylinder=42cm
To Find
Curved surface area ,total surface area and volume of cylinder.
Some important formulas
- Volume of Cylinder=πr²h
- Total surface area of cylinder=2πr(r+h)
- Curved surface area of Cylinder=2πrh
Volume of cylinder =πr²h
=>22/7×(20)²×42
=>22/7×400×42
=>22×400×6
=>22×2400
=52800cm³
Total surface area of Cylinder=2πr(r+h)
=>2×22/7×20(20+42)
=>44/7×20(62)
=>44/7×1240
=>54560÷7
=7794.28cm²
Curved surface area of Cylinder=2πrh
=>2×22/7×20×42
=>44/7×20×42
=>44×20×6
=>44×120
=5280cm²
Extra information=>
● Volume means total space occupy by a 3D object is called its volume.It is measured in cubic units.
●Total surface area means the total area occupy by an object including both outer surface and its inner surface from top to bottom.
●Curved surface area means the area occupy by an object only outer surface area from bottom to top surface.