10. The surface area of a cone is found by adding the area of the cone's base to the cone's lateral surface area. The base of a cone is a circle with an area of r², where r is the radius of the circle. The lateral surface of a cone is given by the expression Trs, where s is the slant height, or the distance from top of the cone to the edge of the base. Define a function f(r) that describes the area of the base of a cone. Define a function g(7) that describes the lateral surface area of a cone. Then simplify the function (f+g)(r).

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