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The length of a rectangular paper is l ...

The length of a rectangular paper is l units and breadth is b units. The rectangular paper is rolled and a cylinder is formed of which perimeter is equal to the length of the paper. The lateral surface area of the cylinder is _________ sq-unit.

Text Solution

Verified by Experts

The correct Answer is:
`lb`
lb , since we know that lateral surface area = circumference of the base `xx` height `=lxxb` sq-units = lb sq-units.
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Knowledge Check

  • If the radius of the base of a cylinder be r units and the height of the cylinder be h units, then the total surface area of the cylinder is

    A
    `2 pi ( h+r)` sq-units
    B
    `2h(pi + r) ` sq-units
    C
    `2 pi r h ` sq-units
    D
    `2 pi r ( h+r)` sq-units

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