Here is another applet that shows the relationship between a regular polygon and the circle. Consider a circle to be a regular polygon with infinitely many sides.[br][br]The apothem is simply the height of each little triangle.[br]The sides of the little isosceles triangle is the radius of the circle.[br]

[b]Method I - Regular Polygon Method[/b][br][br][br][b]Method II - Modified Onion Method[/b][br]