If the volume of a cylinder is 100π unit and the ratio of radius to h

1.	If the volume of a cylinder is 100π unit and the ratio of radius to height is 5 : 4 then find the curved surface area of the cylinder ?1. 400π sq. unit2. 40 sq. unit3. 40π sq. unit4. 140π sq. unit5. None of these
Answer» Correct Answer - Option 3 : 40π sq. unit GIVEN: Volume of cylinder = 100π ⇒ Radius : Height = 5x : 4x FORMULA USED: Volume of cylinder = πr²h cu. Unit CALCULATION: ⇒ πr²h = 100π unit ⇒ r²h = 100 unit ⇒ 25x² X 4x = 100 unit ⇒ x³ = 1 unit ⇒ Radius = 5 unit & height = 4 unit. ⇒ Curved surface = 2πrh ⇒ Curved surface = 40π sq. unit

If the volume of a cylinder is 100π unit and the ratio of radius to height is 5 : 4 then find the curved surface area of the cylinder ?1. 400π sq. unit2. 40 sq. unit3. 40π sq. unit4. 140π sq. unit5. None of these

Answer» Correct Answer - Option 3 : 40π sq. unit

GIVEN:

Volume of cylinder = 100π

⇒ Radius : Height = 5x : 4x

FORMULA USED:

Volume of cylinder = πr²h cu. Unit

CALCULATION:

⇒ πr²h = 100π unit

⇒ r²h = 100 unit

⇒ 25x² X 4x = 100 unit

⇒ x³ = 1 unit

⇒ Radius = 5 unit & height = 4 unit.

⇒ Curved surface = 2πrh

⇒ Curved surface = 40π sq. unit

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If the volume of a cylinder is 100π unit and the ratio of radius to height is 5 : 4 then find the curved surface area of the cylinder ?1. 400π sq. unit2. 40 sq. unit3. 40π sq. unit4. 140π sq. unit5. None of these

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