A rectangular sheet of paper is folded about its width 15cm . If the length of the sheet is 22cm find the volume of the hollow cylinder thus formed
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Length of rectangular sheet = 22cm
breadth of rectangular sheet = 15 cm
Now,it is folded so length becomes circumference and breadth becomes height
Circumference of cylinder = 2πr
22 = 2×22÷7×r
22×7÷44 = r
7÷2 = r
Radius of cylinder = 7÷2cm
height of cylinder = 15cm
Volume of cylinder = πr square×h
= 22÷7×7÷2×7÷2×15
= 577.5cm cube
breadth of rectangular sheet = 15 cm
Now,it is folded so length becomes circumference and breadth becomes height
Circumference of cylinder = 2πr
22 = 2×22÷7×r
22×7÷44 = r
7÷2 = r
Radius of cylinder = 7÷2cm
height of cylinder = 15cm
Volume of cylinder = πr square×h
= 22÷7×7÷2×7÷2×15
= 577.5cm cube
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