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It is called a base quantity.
However, the distinction between a base quantity and a derived quantity is often not clear. For example, the second and metre are meant to be the base units for time and length. But the metre itself is defined in terms of the distance travelled by light, through vacuum, in 1/299,792,458 of a second. Consequently, a metre itself can be considered a derived unit.
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Is volume a derived quantity?
yes it is,it is derived by cubing the fundamental unit of length
Why is area called derived quantity?
An area, in its simplest form is derived by multiplying together two lots of the basic quantities - lengths.
Why is density a derived quantity?
It is a measure of mass per unit volume and is derived using measures of mass and lengths in three orthogonal dimensions.
Which property says that if a first quantity equals a second quantity then the second quantity equals the first quantity?
That's the reflexive property of equality.
Why do you get an even number when you add two even numbers?
An even number is always some quantity of 'twos' (2's), and any quantity of twos is an even number. The first even number is a quantity of twos, and the second even number is another quantity of twos. When you add the first quantity of twos to the second quantity of twos, you get a new quantity of twos. Since the new quantity of twos is a quantity of twos, it's an even number.
