It has been three seasons since the Dallas Cowboys appeared in the NFC playoffs, and "America's Team" is understandably desperate to return to its former glory, even if it means hitting the books a little harder this off-season. In fact, the Cowboys are using one tactic in particular to kick-start their middling offense: geometry quizzes.

Last month, Jason Garrett, the team's Princeton-educated, offensive guru of a head coach, corralled his players in a closed-door team meeting and told them they needed to be intensely...