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pi times l times r (r and l are the radius and slant height, respectively)This can be derived by using a ratio (area/circumference) of the circle with radius L (slant height) with the ratio of the arc (arc-area/arclength). It should look something like this.

(pi*l^2)/(2pi*l) = (arc-area)/(2pi*r)

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Q: How do you find the lateral surface area of a cone?
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