Question : If the slant height and radius of a right circular cone are 28 cm and 21 cm, respectively, then the total surface area of the right circular cone (in cm2) is: (Take $\pi=\frac{22}{7}$)
Option 1: 3234
Option 2: 3342
Option 3: 3243
Option 4: 3324
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Correct Answer: 3234
Solution :
Given: Slant height, $l$ = 28 cm
Radius, $r$ = 21 cm
The total surface area of the cone
= $\pi r(l+r)$
= $\frac{22}{7}\times21(28+21)$
= $22\times3\times49$
= $3234\ \text{cm}^2$
Hence, the correct answer is 3234 cm
2
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