. Grade 7, Illustrative icon

The Circumference of a Circle and the Area of the Region it Encloses

Illustrative MathematicsVaries

A circle is the set of points that are a specified distance from some fixed point called the center of the circle. The purpose of this task is to help students differentiate between a circle and the region inside of the circle so that they understand what is being measured when the circumference and area are being found. This task is best used as a lead-in to the formulas for circumference and area of a circle. It is common for students to get confused about which parts of a figure are part of the circle itself.

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