Recall:

A circle is the set of all points that are the same distance from a given point, called the centre.

The diameter of the circle is twice as long as the radius.

Recall: We can estimate the circumference and area of a circle using polygons.

As we increase the number of sides in the regular polygon inside the circle, we get closer and closer to the actual circumference and area of the circle. 

Is there a formula for calculating the circumference and area of a circle accurately?

• Develop and apply the formulas for finding the circumference and area of circles.
• Solve problems involving circumference and area of composite shapes.