Sunday, November 3, 2013

Circles, Tangents,Secants, and Chords

Video of the day

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