Let D be a region bounded by a simple closed path C in the xy-plane. The coordinates of the centroid (x, y) of D are given below, where A is the area of D. x = 1/2A contoutintegral_C x^2 dy y = -1/2A contoutintegral_c y^2 dx Use the formula to find the centroid of the triangle with vertices (0, 0), (a, 0), and (a, b), where a > 0 and b > 0, (x, y) = (2)