The curved surface area of a cylindrical tin is 704cm2. If the radius of its base is 8cm, find the height. [Take (pi = frac{22}{7})]`
-
A.
14cm -
B.
9cm -
C.
8cm -
D.
7cm
Correct Answer: Option A
Explanation
Curved surface area = 2(pi h)
704 = 2 x (frac{22}{7} times 8 times h)
704 = (frac{352}{7})h
352h = 704 x 7
h = (frac{704 times 7}{352})
= (frac{4928}{352})
h = 14cm