The Isosceles Triangle Theorem | MathHelp.com - By MathHelp.com
Transcript
| 00:0-1 | So let's say we're given an isosceles triangle with the | |
| 00:04 | vertex angle that measures X degrees And a base angle | |
| 00:09 | that measures 70°. . And we're asked to find the | |
| 00:12 | value of X . Remember that the isosceles triangle theorem | |
| 00:18 | states that if two sides of a triangle are congruent | |
| 00:22 | , then the ankles opposite those sides are congruent . | |
| 00:27 | So here , since we have two congruent sides And | |
| 00:31 | the angle opposite one of the congruent sides measures 70° | |
| 00:37 | , Then we know that the other angle opposite the | |
| 00:41 | other congruent side must also measure 70°. . Now to | |
| 00:48 | find the value of X . remember that the sum | |
| 00:51 | of the measures of the angles of a triangle is | |
| 00:54 | 180°. . So we can set up the equation X | |
| 01:00 | Plus 70 plus 70 equals 180 , Simplifying . On | |
| 01:08 | the left side , 70 plus 70 is 140 . | |
| 01:13 | So we have eggs plus 140 Equals 180 And subtracting | |
| 01:22 | 140 from both sides . Yes , We find that | |
| 01:29 | x equals 40 . So the angles of this isosceles | |
| 01:39 | triangle measure 70 70 and 40° |
Summarizer
DESCRIPTION:
OVERVIEW:
The Isosceles Triangle Theorem | MathHelp.com is a free educational video by MathHelp.com.
This page not only allows students and teachers view The Isosceles Triangle Theorem | MathHelp.com videos but also find engaging Sample Questions, Apps, Pins, Worksheets, Books related to the following topics.
GRADES:
STANDARDS:
