In terms of , give the surface area, in square inches, of a spherical water tank with a diameter of 20 feet.
In terms of , give the surface area, in square feet, of a spherical tank with diameter 36 inches.
, give the surface area, in square inches, of a spherical water tank with a diameter of 20 feet.
, give the surface area, in square feet, of a spherical tank with diameter 36 inches.