Lateral Surface Area of a Cylinder
Lateral Surface Area of a Cylinder
Lateral surface area of cylinder: The curved surface joining the two bases of a right circular cylinder is called its lateral surface.
The lateral surface area of cylinder =
Illustration: The curved surface area of a right circular cylinder of height 14 cm is . Find the diameter of the base of the cylinder.
Solution: Let r be the radius and h be the height of the cylinder.
Then,
then r = 1 cm
Diameter of cylinder = 2 cm
Illustration: The diameter of a roller 120 cm long is 84 cm. If it takes 500 complete revolutions to level a playground, determine the cost of levelling it at the rate of 30 paise per square meter .
Solution: Clearly, the roller is a right circular cylinder of height h = 120 cm and radius of its base = r = 42 cm
So, area covered by the roller in one revolution = Curved surface area of the roller
So, area covered by the roller is 500 revolutions
Hence, the cost of levelling the playground =
Savitri had to make a model of cylindrical Kaleidoscope for her science project. She wanted to use chart paper to make the curved surface of the kaleidoscope. What should be the area of chart paper required by her, if she wanted to make a kaleidoscope of length 25 cm with a 3.5 cm radius? | |||
| Right Option : B | |||
| View Explanation | |||
In a cylinder, if radius is doubled and height is halved, curved surface area will be _________________ | |||
| Right Option : C | |||
| View Explanation | |||
The height of a cylinder is 14 cm and its curved surface is 264 sq. cm. The radius of its base is _____________ | |||
| Right Option : A | |||
| View Explanation | |||
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