Formula for surface area of a cone: S=πrl + πr^2. Solve for l. Then find l when S=283cm^2 and r =5cm.

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Here `r` is the radius of a (right circular) cone. `S = pi r^2` is the area of its base, and `l` is its slant height.

To solve the equation `S = pi r l + pi r^2` for `l` (when we know `S` and `r` ),...

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