Unit 7, Lesson 10
Drawing Triangles (Part 2)
Grade 7
Preparation
Lesson Narrative
In this lesson, students continue their work on drawing triangles with specified angle and side measures. Students focus on drawing a triangle given two side lengths and an angle, and given three angles. They continue to gain experience with a compass, ruler, and protractor. They continue to notice from their drawings when the conditions determine one triangle, more than one, or none, and they increase their precision of language as they describe the conditions to each other (MP6).
Students are not expected to know rules about which conditions determine each possibility.
- Draw triangles with two given side lengths and one angle measure or with three given angle measures, and describe (orally) how many different triangles could be drawn with the given conditions.
- Use drawings to justify (in writing) whether two given side lengths and one angle measure determine one unique triangle.
Let’s draw some more triangles.
Required Materials
Activity 1
Activity 2
Activity 3
Required Preparation
Activity 2
For the digital version of the activity, acquire devices that can run the applet.
Activity 3
For the digital version of the activity, acquire devices that can run the applet.
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