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I know this women talks like a robot, but its a good video.

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Exterior Angle Theorem - MathHelp.com - Geometry Help

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For a complete lesson on the exterior angle theorem, go to http://www.MathHelp.com - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students are asked to solve word problems that involve the triangle sum theorem.

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Triangle Sum Theorem - Part 2 (Solving for X)

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Visit www.doucehouse.com for more videos like this. This is a more advanced video over the triangle sum theorem. In this video, I'm given a problem where I need to solve each angle measure relative to 'x'. I must solve for 'x' first before I can solve for each angle measure.

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Using Isosceles Properties to find a value: 

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Using Isosceles Properties to find a value: 

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Geometry - how to find the measure of x using an isosceles triangle

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http://www.freemathvideos.com In this video series I will show you how to use triangle relationships to solve problems and prove statements.

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Congruent Parts of Corresponding Triangles are Congruent

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the same of the measures of the angles of a triangle is 180 degrees.

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The measure of each exterior angle of a triangle equals the sum of the two measures of its 2 remote interior angles.