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 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?