Conversation so far:
how many feet in 1 acre of land
The total area of an acre of land is 43,560 square feet.
How is square feet measured?
The square foot is defined as the area of a square with sides of 1 foot.
What are the origins of the acre as a unit of measurement?
An acre was roughly the amount of land tillable by a yoke of oxen in one day.
What is a yoke of oxen?
A yoke is a pair of oxen connected by a wooden beam.

Question: So the beam  isn't just for cows?
Self-contained rewrite: What other animals have yokes placed on them?