The square yard is a unit of area and is an imperial unit with the symbol ya².
One square yard is equal in area to a square with edges one yard in length. It also equals 1,296 in² and ≈ 0.836 m².
The square yard is a common unit of measurement in the UK and US.
The square kilometre is a unit of area and is a multiple of the square metre; an SI derived unit. It has the symbol km².
A square kilometre is equal to the area of a square with edges 1km long. There are 1,000,000 square metres in a square kilometre.
Square kilometres are often used to describe expansive areas of land due to the large unit size.