Task# Congruent Triangles

Illustrative MathematicsVaries

This task has two goals: first to develop student understanding of rigid motions in the context of demonstrating congruence. Secondly, student knowledge of reflections is refined by considering the notion of orientation in part (b). Each time the plane is reflected about a line, this reverses the notions of 'clockwise' and 'counterclockwise'. In part (b) it is possible to say more.