Henry Ernest Dudeney/Modern Puzzles/133 - A Problem for Surveyors

by : $133$

 * A Problem for Surveyors
 * There are tricks in every trade, and the science of numbers contains an infinite number of them.
 * In nearly every vocation of life there are little wrinkles and short cuts that are most useful when known.
 * For example:


 * A man bought a little field, and here is a scale map that was given to me.
 * I asked my surveyor to tell me the area of the field,
 * but he said it was impossible without some further measurements;
 * the mere length of one side, $7$ rods, was insufficient.
 * What was his surprise when I showed him in about two minutes what was the area!
 * Can you tell how it is to be done?


 * Dudeney-Modern-Puzzles-133.png