1. what is greater? 2 or 8/3 2. what is greater? 2 1/2 or 2.3

3. what is greater? 0.7 or 7/9

4. what is greater? 33/35 or 35/36

5. what is greater? 2/7 or 6/21

6. what is greater? 10/3 or 3.3

7. what is greater? 7/4 or 1.8

For every corresponding pair of cross sections, the area of the cross section of a sphere with radius r is equal to the area of the cross section of a cylinder with radius and height 2r minus the volume of two cones, each with a radius and height of r. a cross section of the sphere is and a cross section of the cylinder minus the cones, taken parallel to the base of cylinder, is the volume of the cylinder with radius r and height 2r is and the volume of each cone with radius r and height r is 1/3 pie r^3. so the volume of the cylinder minus the two cones is therefore, the volume of the cylinder is 4/3pie r^3 by cavalieri's principle. (fill in options are: r/2- r- 2r- an annulus- a circle -1/3pier^3- 2/3pier^3- 4/3pier^3- 5/3pier^3- 2pier^3- 4pier^3)