Final answer:
A pica measures approximately 1/6 of an inch and is made up of 12 points, a standard unit in typography for font sizes and spacing.
Step-by-step explanation:
A pica is close to 1/6 of an inch. In terms of its composition, a pica is made up of 12 points. This is a standardized measurement in typography, used particularly for measuring font sizes and the spacing in printed materials. When measuring small objects like the diameter of a toothpick, smaller units such as inches, centimeters, or millimeters would be more appropriate to use for precision. Additionally, when accuracy is crucial, and especially when a value like p is only known to two digits, quoting measurements to the same level of precision is important.