4, Lesson 7, Unit 7, Grade 7, OpenUp icon
Instructional Activity

How Long Is the Third Side?

Lesson 7. Unit 7. Grade 7 Open Up Resources

Open Up Resources15 min(s)

This Instructional Activity is a part of the Lesson 7, Unit 7, Grade 7. The purpose of this activity is for students to experience that the sum of the lengths of the two shorter sides of a triangle must be greater than the length of the longest side. Students continue working with the cardboard strips and fasteners from the previous lesson to see how many different triangles they can build given two of the three side lengths.

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