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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