Circle Terminology  
 
Introduction  
In this section of MATHguide, you will learn a variety of terms that are associated with circles. Here are the topics within this page:

We will look at geometric objects related to circles. The first object is a radius.
 
The next geometric object for us to examine is a chord.
 
Our next geometric object is a diamter.
 
Next on our list of geometric objects is a secant line.
 
The next geometric object is one that has great significance within calculus. It is a tangent.
 
The next geometric object is called the point of tangency.
An interesting fact concerning point of tangencies is this: A radius drawn to a point of tangency is always perpendicular to the tangent line. This can be seen within the next diagram.
 
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