4) The base of a solid is the triangle in the xy-plane with vertices (0, 0), (1, 0), and (0, 1). The cross- sections of the solid perpendicular to the x-axis are squares. What is the volume of the solid. 5) 5. Find the volume of the solid obtained by rotating the area between the graphs of y = x2 and x = 2y around the y-axis