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 5/7cm2
B. 240 2/7cm2
C. 235 5/7cm2
D. 282 6/7cm2

Correct Answer: D. 282 6/7cm2

Explanation

πrl + πr² = πr(l + r)

²²/₇ x 5(13 + 5)

282 6/7cm²

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