


Description 



Diameter: The distance across a circle through its center. The line segment that includes the center and whose endpoints lie on the circle. 
The line segment that goes through the center of the circle and
whose endpoints are on the circumference of the circle is called a
diameter. The length of this line segment is also called the diameter.
The line segment that has one endpoint as the center of the
circle and the other endpoint on the circumference of the circle is called the
radius of the
circle. What do you think the relationship is between the radius and the
diameter? If you aren't sure, measure the diameter and radius of a circle. What
do you notice?


