A rectangular sheet of paper $44$ cm $\times 18$ cm is rolled along its length to form a cylinder (so its…
A rectangular sheet of paper $44$ cm $\times 18$ cm is rolled along its length to form a cylinder (so its length becomes the circumference). The radius of the base is (use $\pi=\dfrac{22}{7}$):
$7$ cm
$14$ cm
$3.5$ cm
$11$ cm
Solution
Length becomes circumference: $2\pi r = 44 \Rightarrow r = \dfrac{44 \times 7}{2 \times 22} = 7$ cm.