Find the area of the lateral surface over the curve C in the xy-plane and under the surface z = f(x,y), where the lateral surface area is is given by the integral below. f(x,y) = x + y

C: x^2 + y^2 = 9 from (3, 0) to (0, 3)

C: x^2 + y^2 = 9 from (3, 0) to (0, 3)

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