Square root of the surface of a sphere × 1.772454 = Circumference.
Square of one of its sides × 6 = Surface of a cube.
Area of the base of a square, round or triangular pyramid, or of a cone, × one-third of its altitude = Solidity.
Area of square × .7854 = Area of largest circle within it.
Area of circle × .625 = Area of largest square within it.
Spheres.—Square of circumference × .3183 = Surface of sphere.
Square of diameter × 3.1416 = Surface of sphere.
Square root of surface × .5642 = Diameter of sphere.
Cube of diameter × .5236 = Solidity of sphere.
Cube of circumference × .0169 = Solidity of sphere.