Question
A rectangle with a length of 16 cm and breadth of 8 cm
is rolled through its length to form a hollow cylinder. What will be the volume (in cm³) of the cylinder? (Use π = 3.14)Solution
ATQ, The circumference of the circular end of the cylinder = breadth of the rectangle. So, 2 × π × radius = 16. 2 × 3.14 × radius =16 
Now, the height of the cylinder = breadth of the rectangle = 8 cm. Required volume 
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3, 5, 20, 24, 144, 150, ?
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What will come in place of the question mark (?) in the following series?
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