\begin{definition}[Definition:Imperial/Area/Rood]
The '''rood''' is an imperial unit of area.
One '''rood''' is equal to an oblong measuring $1$ chain by $2 \frac 1 2$ chains.
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''rood'''
}}
{{eqn | r = 2 \tfrac 1 2
      | c = square chains
}}
{{eqn | r = 40
      | c = square rods, poles or perches
}}
{{eqn | r = 1210
      | c = square yards
}}
{{eqn | r = 10 \, 890
      | c = square feet
}}
{{end-eqn}}
:400px
\end{definition}