The circle is one of the first shapes children typically learn to draw, because straight lines tend to be more difficult. This is why toddler drawings can be seen as having many rounded scribbles on them. The circle, though simple, is a fundamental part of the universe and even your everyday life. Look anywhere and you will see circles: steering wheels, tires, Ferris wheels, coins… In most cases, these are in the shape of a circle for good reason, like tires. A circle is defined in MathGoodies.com as “a shape with all points the same distance from its center.” The circle has a diameter which is the distance from one side to the other passing through the center, and the radius is half of the diameter. The circumference is the distance around a circle, and an arc is a portion of that circumference.