An NFL playing field is 360 ft by 160 ft. Prove that during an NFL game:
(a) Two of the 22 players are within 75 ft of each other.
(b) Four of the 22 players are within 50 yards of each other.
My question is can I divide the field into squares of 50 and 75 ft so I can use the pigeonhole principle as a proof? Is the proof that simple or is it more complex?