The curved surface area of a cylindrical tin is 704cm2. Calculate the height when the...
MATHEMATICS
WAEC 1992
The curved surface area of a cylindrical tin is 704cm2. Calculate the height when the radius is 8cm. [Take π = 22/7]
- A. 3.5cm
- B. 7cm
- C. 14cm
- D. 28cm
Correct Answer: C. 14cm
Explanation
Curved surface area of a cylindrical tin = \(2\pi rh\)
\(\therefore 2\pi rh = 704cm^2\)
\(2 \times \frac{22}{7} \times 8 \times h = 704\)
\(h = \frac{704 \times 7}{2 \times 22 \times 8}\)
\(h = 14cm\)
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