How many right-angled triangles are there with sides that are all integers less than 100 units?
Which is a better fit, a square peg in a round hole or a round peg in a square hole?
A rectangular field has two posts with a ring on top of each post. There are two quarrelsome goats and plenty of ropes which you can tie to their collars. How can you secure them so they can't fight each other but can reach every corner of the field?