THIS MONTH'S QUIZ
ABCDWXYZ is a square room measuring 20 ft by 20 ft, and 10 ft high, as shown.
1. A badly-educated fly spends its life flying in a straight line between points D and X. Find the length of its flight-path.
2. A spider, more intelligent than the fly but excessively timid, cowers in the corner W. What is the least distance between the spider and the fly?
3. If the spider musters sufficient courage to venture along the line WZ, then what is the least distance it can ever be from the fly?