This week in Geometry, I learned about the different lines and segments that intersect a circle. The first line that intersects a circle is called the diameter. The diameter is the line segment that goes through the center of the circle and ends at each opposite end of the circle. The radius is half of the diameter, so it is a line segment that starts at the center point of the circle and ends at the edge of the circle. Now for the new stuff. A chord is a line segment where the endpoints lie on the edge of the circle. A secant is a line goes through the circle at two points. A tangent is a line that intersects with the edge of the circle on only one point. Don’t confuse tangent as a line with the tangent for angles. And finally, the point of tangency is the point where the tangent intersects with the edge of the circle. Here is a circle that shows the chord, the secant, and the tangent. I hope you learned something.

## Recent Comments