A cylinder of radius and height both equal to 10 cm. made by paper is unfolded to form a plane she

M4maths Previous Puzzles

04 Sep 2009 Paper sheet

A cylinder of radius and height both equal to 10 cm. made by paper is unfolded to form a plane sheet of paper.
If circumference of a circle is 2ΠR, then area of plane paper sheet is-

OPtion

1) 100Π
2) 400Π
3) 300Π
4) 200Π
5) 20Π
6) 10Π
7) 40Π
8) 2Π
9) 5Π
10) 50Π

Solution

When we unfold a cylinder, its height becomes breadth of paper and circumference becomes length of paper,
therefore area is l×2ΠR = 10×2Π×10 = 200Π

Correct Option: 4 Best Solution (0)