Find the area of the surface generated by revolving the curve y = Osxs2, about the x-axis. 392x The area of the surface is (Type an exact answer, using x as needed.) 243

An indoor physical fitness room consists of a rectangular region with a semicircle on each end. The perimeter of the room is to be a 200-meter single-lane running track. (a) Draw a diagram that illustrates the problem. Let x and y represent the length and width of the rectangular region, respectively.(b) Determine the radius r, in terms of y, of the semicircular ends of the track. r =   Determine the distance d, in terms of y, around the inside edge of the two semicircular parts of the track. d =  (c) Use the result of part (b) to write an equation, in terms of x and y, for the distance traveled in one lap around the track. Solve for y. y =  (d) Use the result of part (c) to write the area A of the rectangular region as a function of x. A =  (e) Use a graphing utility to graph the area function from part (d). Use the graph to approximate the dimensions that will produce a rectangle of maximum area. (Round your answers to two decimal places.) x  =    y  =