What is the whole surface area of a cone with a base radius of 6 cm and a height of 8 cm?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 301.71 cm².
A cone with a base radius (r) of 6 cm and height (h) of 8 cm
The whole surface area of a cone = πr(r + l)
Slant height, l = √r² + h²
l = √6² + 8² = 10 cm
The whole surface area = πr(r + l) = (22/7) × 6 (6 + 10) = 301.71 cm2