What is a Circle?

A circle is a set of all the points that are the same distance from one central point
This central point is called the "center" of the circle
The diameter is the distance across the circle through the center
The radius is the distance from the center to any point on the circle
The chord is the distance between any two points on the circle
Note that the radius is always equal to half of the diameter!

1. A circle is a set of all the points that are the same distance from one central point
2. This central point is called the "center" of the circle
1. A circle is a set of all the points that are the same distance from one central point
2. This central point is called the "center" of the circle
3. Other than the center, there are three main parts of a circle:
4. the diameter, radius, and chord
1. To be a diameter, the line must go through the center point
1. By definition, all points on a circle are the same distance from the center
2. So the radius is the same no matter what point it goes to on the circle!
3. The radius will also always be half of the diameter
4. So the diameter will also be the same no matter where you draw it!
1. Unlike the diameter, the chord does not need to go through the center point of the circle
2. It just needs to connect two points along the circle

Definition: What is a circle?