The curved surface area of a cylindrical tin is 704cm 2 . If the radius
MATHEMATICS
WAEC 2012
The curved surface area of a cylindrical tin is 704cm2. If the radius of its base is 8cm, find the height. [Take π=227]
- A. 14cm
- B. 9cm
- C. 8cm
- D. 7cm
Correct Answer: A. 14cm
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
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