navratan
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A Square piece of paper of side 22 cm is rolled to form a cylinder.Find the volume of the cylinder.(take Pie =22/7)?

Answer :

thinkdifferent
When a square piece is rolled out its side become its height and circumference so 2 pi r = 22 => 22/7 r = 11 => r = 7/2 now volume of cylinder = pi r^2 h = 22/7. X 7/2 x 7/2 x 22 = 11 x 7 x 11 = 847 cubic cm
2.pi.r=22
pi.r=11
22r=77
r=7/2
               vol.=pi.r².h
                   =22/7.7/2.7/2.22
                  =847 cm³

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