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Circles, Tangents,Secants, and Chords

A tangent to a circle is a line that touches a circle at one point. A secant is a line that intersects a circle at two points, and a chord is a line that links two points on a circle. This video reviews the properties and formulas for these lines and how they can be used to find missing lengths.

Video Guide

:30 Lengths of the tangents explained

1:23 Rules for two tangents drawn to a circle

2:11 Finding the perimeter of a triangle using tangents of a circle

2:35 Formula for chords explained

3:20 Application problem using the formula for chords

4:30 Formula for secants ( The product of the lengths of the secant segment and it's external segment is equal to the product of the lengths of the second secant segment and its external segment

4:53 Formula for secants explained

7:08 Application problem using one secant and one tangent

8:11 Example problem using a circle,tangent, and a secant