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Calculate the total surface area of a cone of height 12cm and base radius 5cm....

Mathematics
WAEC 1993

Calculate the total surface area of a cone of height 12cm and base radius 5cm. [Take π = 22/7]

  • A. 180\(\frac{5}{7}\)cm\(^2\)
  • B. 240\(\frac{2}{7}\)cm\(^2\)
  • C. 235\(\frac{5}{7}\)cm\(^2\)
  • D. 282\(\frac{6}{7}\)cm\(^2\)
  • E. 361\(\frac{3}{7}\)cm\(^2\)
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Correct Answer: Option D
Explanation

πrl + πr2 = πr(l + r)
\(\frac{22}{7}\) x 5(13 + 5)
282\(\frac{6}{7}\)cm\(^2\)

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