## Reflection: Connection to Prior Knowledge Congruent Triangles Based on Rigid Motions - Section 2: Mini-Lesson

I was pleased my students were applying the Pythagorean Theorem to prove a triangle and its reflection over the y-axis were congruent. In my class we hadn't explicitly used the Pythagorean Theorem which means they were able to connect what they had learned in previous classes to this lesson. Applying the Pythagorean Theorem helped students see that two triangles are congruent to each other if all three of the sides in the pre-image are congruent to the corresponding sides in the image.

Connection to Prior Knowledge: Congruent Triangles Based on Rigid Motions Mini-Lesson Reflection

# Congruent Triangles Based on Rigid Motions

Unit 4: Rigid Motions
Lesson 2 of 3

## Big Idea: Students will examine triangles on the coordinate plane and use rigid motions to show two triangles are congruent.

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Standards:
45 minutes

### Marisa Laks

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