Find the volume of the solid by the method of slicing. The base of a solid is the region bounded by the graphs of y = and y = x. Present an exact answer, using fractions if %3D needed. (a) Find the volume V of the solid if slices made perpendicular to the y-axis have cross sections that are semicircles. (b) Find the volume V of the solid if slices made perpendicular to the y-axis have cross sections that are equilateral triangles.