Instructional Activity# Polygon Angles

Lesson 3. Unit 7. Grade 7 Open Up Resources

Open Up Resources10 min(s)

This Instructional Activity is a part of the Lesson 3, Unit 7, Grade 7. In this activity, students see that angles do not need to be adjacent to each other in order to be considered complementary or supplementary. Students are given two different polygons and are asked to find complementary and supplementary angles, using any tools in their geometry toolkit. The most likely approaches are: measure each angle with a protractor and and look for any that sum to 180 or 90 degrees, trace the legs of an angle with tracing paper and align its vertex and one leg with another angle to see if the two angles, when adjacent, form a straight angle or a right angle. As students work, monitor for students who use either approach listed or some other strategy.