Propositiones ad Acuendos Juvenes/Problems/25 - De Campo Rotundo

by : Problem $25$

 * De Campo Rotundo: A Round Field
 * A round field is $400$ perches in circumference.


 * How many acres does it contain?

Solution
The fourth part of the field's $400$ perches in circumference is $100$.

Multiply this by itself to get $10 \, 000$.

Divide this in $12$ parts; the result is $833$.

Divide this into $12$ parts again; the result if $69$.

This is the number of acres in the field.