Khan Academy
Khan Academy: Geometry: Triangle Angle Example 3
Explains how to solve for multiple missing angles in a diagram composed of multiple triangles using the triangle sum theorem and other angle relationships. This video also appears in the Geometry: Triangles strand. [5:42]
Khan Academy
Khan Academy: Geometry: Angle Game (Part 2)
Solving for unknown angle measures using knowledge of different angle relationships and the triangle sum theorem. Continuation of Angle Game video. [9:49]
Khan Academy
Khan Academy: Geometry: The Angle Game
Solving for unknown angle measures using knowledge of different angle relationships and the triangle sum theorem. [9:01]
Khan Academy
Khan Academy: Geometry: Proof Sum of Measures of Angles in a Triangle Are 180
Proof that the sum of the angles in a triangle is 180 using the relationship of angles formed when parallel lines are cut by a transversal. This video also appears in the Geometry: Triangles strand. [6:31]
Khan Academy
Khan Academy: Geometry: Ca Geometry: Deducing Angle Measures
Demonstrates how to solve five different problems from a released California Geometry state test that involve finding the measures of angles in different polygons. This video also appears in the Geometry: Worked Examples section. [10:58]
Khan Academy
Khan Academy: Geometry: Figuring Out All Angles for Congruent Triangles Example
Explains how to use given triangle congruency statements to determine the unknown measures of all angles in a diagram where one large triangle is divided into three congruent triangles. [4:35]
Khan Academy
Khan Academy: Geometry: Equilateral and Isosceles Example Problems
Demonstrates how to use the triangle sum theorem, properties of equilateral and isosceles triangles, and special angle pairs to determine the unknown measures of angles in three different diagrams. [6:27]
Khan Academy
Khan Academy: Geometry: Example Involving Isosceles Triangle and Parallel Lines
Demonstrates how to use the triangle sum theorem, properties of isosceles triangles, and special angle pairs formed when parallel lines are cut by a transversal to set up an equation using given algebraic expressions for angle measures...
Khan Academy
Khan Academy: Geometry: Challenging Triangle Angle Problem
Demonstrates how to find the sum of the exterior angles of an irregular pentagon by breaking the pentagon into three triangles and using the triangle sum theorem. [8:37]
Khan Academy
Khan Academy: Geometry: Another Isosceles Example Problem
Explains how to use given algebraic expressions for the measures of angles in an isosceles triangle and apply knowledge of the triangle sum theorem and the knowledge that the base angles of an isosceles triangle are congruent to...
Virtual Nerd
Virtual Nerd: How Do You Find a Missing Angle in a Triangle?
It's important to remember that the interior angles of a triangle always add up to 180 degrees. This tutorial shows you how to put this knowledge into an equation and solve to find a missing measurement. [4:22]
Virtual Nerd
Virtual Nerd: How Do You Find Missing Angles in an Isosceles Triangle?
Watch this tutorial to learn how identifying a triangle first can be helping in solving for a missing angle measurement. [4:29]
Virtual Nerd
Virtual Nerd: Why Are the Angles of Equilateral Triangles Always Equal to 60 Degrees?
In this tutorial, learn how to find the measurements of the interior angles of an equilateral triangle. [5:02]
Khan Academy
Khan Academy: Triangles: Triangle Angle Example 3
Explains how to solve for multiple missing angles in a diagram composed of multiple triangles using the triangle sum theorem and other angle relationships.
Khan Academy
Khan Academy: Sal's Old Angle Videos: Angle Game (Part 2)
Solving for unknown angle measures using knowledge of different angle relationships and the triangle sum theorem.
Khan Academy
Khan Academy: Sal's Old Angle Videos: The Angle Game
Solving for unknown angle measures using knowledge of different angle relationships and the triangle sum theorem.
Khan Academy
Khan Academy: Triangles: Proof Sum of Measures of Angles in a Triangle Are 180
Video proving that the sum of the measures of the angles in a triangle are 180.
Virtual Nerd
Virtual Nerd: Find Missing Angles in an Isosceles Triangle Using Right Triangles
Discover how identifying your triangle first can be very helpful in solving for a missing interior angle measurement. [3:40]
Virtual Nerd
Virtual Nerd: How Do You Find a Missing Angle in a Right Triangle?
It's important to first identify what type of triangle you're working with before trying to solve for a missing interior angle measurement. Learn how by watching this tutorial. [3:34]
Virtual Nerd
Virtual Nerd: How Do You Find Missing Angles in a Triangle With Variables?
This tutorial shows you how to use the Triangle Sum Theorem to find the interior angle measurements of a given triangle. [5:09]
Khan Academy
Khan Academy: Geometry: Finding More Angles
Solving for measures of the angles in a triangle using algebra, the triangle sum theorem, and properties of angles created by a transversal that cuts parallel lines. [6:05]
Khan Academy
Khan Academy: Geometry: Triangle Angle Example 2
Shows how to find the measure of missing angles using the triangle sum theorem and vertical angles. This video also appears in the Geometry: Triangles strand. [4:55]
Khan Academy
Khan Academy: Geometry: Triangle Angle Example 1
Explains how to use the triangle sum theorem to solve for missing angle measures in a triangle. Also addresses the relationship between the measure of an exterior angle of a triangle and the measures of the remote interior angles. This...
Khan Academy
Khan Academy: Angles (Part 3)
Identifies and defines the types of angles formed by parallel lines cut by a transversal and the relationship of their measures.