16. The area of the end of a cylinder multiplied by its length, equals its solid content.
17. The area of the internal diameter of a cylinder multiplied by its depth, equals its cubical capacity.
18. The square of the diameter of a cylinder multiplied by its length, and divided by any other required length, the square root of the quotient equals the diameter of the other cylinder of equal solidity, or capacity.
19. The square of the diameter of a sphere multiplied by 3·1416 equals its convex surface.
20. The cube of the diameter of a sphere multiplied by ·5236, equals its solid content.
21. The height of any spherical segment, or zone, multiplied by the diameter of the sphere, of which it is a part, and by 3·1416, equals the area, or convex surface of the segment;
22. Or, the height of the segment multiplied by the circumference of the sphere of which it is a part, equals the area.
23. The solidity of any spherical segment is equal to three times the square of the radius of its base, plus the square of its height, and multiplied by its height, and by ·5236.
24. The solidity of a spherical zone equals the sum of the squares of the radii of its two ends, and one-third the square of its height, multiplied by the height, and by 1·5708.