Students explore triangle congruence conditions as they work to solve a real-world problem. They use Geometer's Sketchpad to apply congruence criteria.

Students explore triangle congruence conditions as they work to solve a real-world problem. They use Geometer's Sketchpad to apply congruence criteria. Teachers will probably want to supplement the treatment of the SSA non-congruence condition, which is mentioned but not fully developed. Discussion questions and suggestions for assessment are included. (sw)