4, Lesson 8, Unit 2, Grade 8, OpenUp icon
Instructional Activity

Similar Figures in a Regular Pentagon

Lesson 8. Unit 2. Grade 8 Open Up Resources

Open Up Resources10 min(s)

This Instructional Activity is a part of the Lesson 8, Unit 2, Grade 8. This activity presents a complex figure with many triangles and asks students to find triangles similar to a given triangle. From the previous activity, students know that finding two pair of congruent angles is sufficient to show similarity. Students may also measure all three angles and check that they are congruent. In addition to using angle measures, students can describe transformations that take one triangle to another.

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