Question : What is the whole surface area of a cone with a base radius of 6 cm and height of 8 cm?
Option 1: 354.50 cm2
Option 2: 350.51 cm2
Option 3: 301.71 cm2
Option 4: 364.61 cm2
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Correct Answer: 301.71 cm 2
Solution : Given: Base, $r$ = 6 cm Height = 8 cm So, slant height, $l$ = $\sqrt{6^2+8^2}=10$ The surface area of a cone = $\pi r(r+l)$ = $\frac{22}{7}×6×(6+10)=\frac{2112}{7}=301.71$ cm 2 Hence, the correct answer is 301.71 cm 2 .
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Question : The lateral surface area of a frustum of a right circular cone, if the area of its base is 16$\pi$ cm2, the diameter of the circular upper surface is 4 cm and the slant height is 6 cm, will be:
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