SOLUTION: the slant height of a cone is twice it's base radius r, express the total surface area of the cone in terms of π and r

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Question 1142429: the slant height of a cone is twice it's base radius r, express the total surface area of the cone in terms of π and r
Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


Base area = %28pi%29%28r%5E2%29

Lateral surface area: %28pi%29%28r%29%28l%29 where l is the slant height; so
lateral surface area = %28pi%29%28r%29%282r%29

Total surface area = base area plus lateral surface area.