The curved surface area of a cylindrical tin is 704cm(^2). Calculate the height when the radius is 8cm. [Take π = 22/7]
-
A.
3.5cm -
B.
7cm -
C.
14cm -
D.
28cm -
E.
32cm
Correct Answer: Option C
Explanation
Curved surface area of a cylindrical tin = (2pi rh)
(therefore 2pi rh = 704cm^2)
(2 times frac{22}{7} times 8 times h = 704)
(h = frac{704 times 7}{2 times 22 times 8})
(h = 14cm)