(1) Draw a square and partition it ever 10 ft on the x and y axises
(2) Start putting dots(trees) in the squares making sure the dots are 10ft a part.
I need help solving this question using the Pigeonhole Principle:
How many trees can Farmer Ferd plant within 100 foot square field if they are to be no closer than 10 feet apart? Neglect the thickness of the trees and assume that trees may be planted on the boundary of the field.