IF YOU ARE NOT perpetual20 or saraelaw2010 pls DO NOT ANSWER MY QUESTION (unless you want to super bad/ur desperate) free points Pls follow me for more daily point giveaways!!! What is 10 + 10? Also, perpetual20 said to do 50 points, here it is. I know saraelaw2010 just wasted all her points so here you go. Also, I have 453 points so don't worry if I run out or something like that

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)