Unit 2, Lesson 2
Congruent Parts, Part 2
Integrated Math 1
Preparation
Lesson Narrative
In this lesson, students determine that if any pair of corresponding parts is not congruent, then the two figures cannot be congruent. Students attend to precision (MP6) as they determine whether congruence statements about figures are true in the Warm-up and look for corresponding parts in the activities. Students preview the criteria for triangle congruence shortcuts as they examine a set of congruent parts, Side-Side-Angle, that are not sufficient to establish the triangles as congruent.
Technology isn't required for this lesson, but there are opportunities for students to choose to use appropriate technology to solve problems. We recommend making technology available.
Math Community
In today’s activities, students are introduced to the idea of math norms as expectations that help everyone in the room feel safe, comfortable, and productive doing math together. Students then consider what norms would connect and support the math actions the class recorded so far in the Math Community Chart.
- Justify (in writing) whether or not figures are congruent by reasoning about rigid transformations.
- Practice generating (orally and in writing) and comprehending congruence statements that establish corresponding parts.