19. To find the solid contents of a pyramid: Rule - Find the area of the base and multiply this by -J- height.

20. To find the solid contents of a cylinder: Rule - Multiply the area of the base by the height.

21. To find the solid contents of a cone: Rule - Multiply the area of the base by 1/3 of the height.

22. To find the solid contents of a sphere: Rule - Multiply the cube of the diameter by .5235.