What is the area of a circle? Explore with the following applet.
The more parts you break the circle into, the closer the result from the applet will resemble a rectangle. [br][br]The height of this rectangle will be r, the length of this rectangle will be what?
[math]\frac{1}{2}\cdot2\pi r[/math]
For the area of a rectangle we multiply the base and the height. [br][br]Therefore the formula for the area of a circle after simplifying is ___________