The area bounded by the curves c = 0, y = e and y = e can be expressed by the integral dc. Select a blank to input an answer Q2 SAVE HELP REPORT 5 To find the volume of a sphere of radius R, the cross sections are| trapezoids If the sphere is centred at the origin, then re (], Therefore V = A(x) dr. Consider a two-dimensional version of the sphere. It's shape is a circle. Let (To, yo) be the point on the circle above the r-axis, at a given z-value To. Then the points (0, 0), (To, 0), and (Zo, yo) form a triangle. The hypotenuse has length or Therefore = , or yo = [ ]. This is the radius of the cross section, so A(I) = Then v - fax