This Instructional Activity is a part of the Lesson 2, Unit 3, Grade 7. The purpose of this activity is to reinforce students' understanding of the terms diameter, center, and radius and also for students to see what a compass is good for. Before using the compass, students first attempt to draw a circle freehand. Then, they recognize the compass as a strategic tool for drawing circles. Students will apply this understanding in later units, for example, when they construct a triangle given the lengths of its three sides.