A rectangular paper of 44 cm long and 6 cm wide is rolled to form a cylinder of height equal to width of the paper. The radius of the base of the cylinder so rolled is :
Options:
A . 3.5 cm
B . 5 cm
C . 7 cm
D . 14 cm
Answer: Option C Length of rectangle paper = Circumference of the base of cylinder If r is the radius of the cylinder : $$\eqalign{ & \Rightarrow 44 = 2\pi r \cr & \Rightarrow r = \frac{{44 \times 7}}{{2 \times 22}} \cr & \Rightarrow r = 7\,cm \cr} $$
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