A quantity formed from the combination of other measurements is a derived quantity.

Here's why:

* Derived quantities are quantities that are defined in terms of other, more fundamental quantities.

* Fundamental quantities are the basic building blocks of measurement. Examples include length, mass, time, temperature, and electric current.

Examples of Derived Quantities:

* Speed: Derived from distance (fundamental) and time (fundamental)

* Area: Derived from length (fundamental) and width (fundamental)

* Volume: Derived from length (fundamental) cubed

* Density: Derived from mass (fundamental) and volume (derived)

Let me know if you'd like more examples!