Circles Amazing?

Yes, circles are in fact very amazing shapes. 

First, there are four different lines and segments that intersect circles. They are:

1. Chord: This is a segment whose two endpoints lie on a circle.

2. Secant: This is a line that intersects a circle at any two points.

3. Tangent: This is a line that intersects a circle at only one point.

4. Point of Tangency: This is the point where a tangent intersects a circle.

Also, when learning about triangles, the terms radius and diameter should be known.

Radius: This is a segment that spreads from the exact point in the middle of a circle to the circle itself.

Diameter: This is a segment that splits the circle exactly in half, and it is also twice the size of the radius.