Help plsss Which of the following is an equation of a circle in the xy-plane with center (1, 2) that has a radius with an endpoint at (-5, -6)?
A) (x - 1)^2 + (y-2)^2 = 100
B) (x - 1)^2 + (y-2)^2 = 10
C) (x+1)^2 + (y + 2)^2 = 100
D) (x+1)^2 + (y + 2)^2 = 10

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)