Provide "acknowledged body of knowledge" related to the concept. Emphasize the most significant aspects of the concept in an organized, organic manner. Present information sequentially so students see continuity. Draw attention to important, discrete details; don't swamp students with myriad facts.

Lecture on properties of similarity

Objective: To inform students of principles of similar polygons

Lecture on properties of similar polygons. Demonstrate similarity principles of triangle altitudes, medians, and segment parts formed by angle bisectors. Have students construct and measure these and write conjectures. Discuss findings.

Evaluation: Student questions, participation and conjectures