The surface area of a frustum cone is 2,200 cm2. The larger and smaller radius of the cone is 20 and 10 cm. find its slant height. (Use $\pi$ = 22/7).

Assuming the given surface area of 2200 square centimeters refers to the curved surface area, the formula is pi multiplied by the sum of the radii and the slant height. Substituting the known values gives 2200 equals 22 over 7 multiplied by (20 plus 10) multiplied by the slant height. Solving for the slant height gives 2200 over 7 equals 30 multiplied by the slant height, which means the slant height is 220 divided by 33. The result is 6.666 centimeters.

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