Task# Circumference of a Circle

Illustrative MathematicsVaries

The goal of this task is to study the circumferences of different sized circles, both using manipulatives and from the point of view of scaling. Measuring the circumference of a circle is challenging because most rulers are designed to measure straight distances. A good technique would be to use a piece of string to wrap around the circles and then the string can be straightened out and measured. The teacher will have to supply compasses, rulers, and string for part (a) of the task.