A certain lighthouse is a tall thin cylinder of brick

A certain lighthouse is a tall thin cylinder of brick, with a light chamber at the top. The brick extends from the ground to the floor of the light chamber. The brick siding of the lighthouse is in need of painting. How many square feet of brick does it have?

(1) The outer diameter of the brick portion of the lighthouse is 28 ft
(2) There are 274 steps from ground level to the floor of the light chamber, and each one is 8 inches high.

[spoiler]OA=C[/spoiler]

Source: Magoosh

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