Khan Academy
Khan Academy: Find Measure of Vertical Angles
Demonstrates how to find unknown angles for two intersecting lines when some angle information is given. [3:00]
Virtual Nerd
Virtual Nerd: What Are Vertical Angles?
Vertical angles are always congruent to one another. Take a look at this tutorial to learn about and see how to identify vertical angles. [4:07]
Virtual Nerd
Virtual Nerd: What Are Complementary Angles?
Complementary angles always add up to 90 degrees. Watch this tutorial to learn about complementary angles and see how to use this knowledge to solve a problem involving these special types of angles. [3:20]
Virtual Nerd
Virtual Nerd: How Do You Use Complementary Angles to Find a Missing Angle?
View this tutorial to see how to use what you know about complementary angles to find a missing angle measurement. [3:20]
Virtual Nerd
Virtual Nerd: What Are Supplementary Angles?
Take a look at this tutorial as it introduces you to supplementary angles and shows you how to use them to solve for a missing angle measurement. [3:20]
Khan Academy
Khan Academy: Geometry: Introduction to Angles (Old)
Defines an angle, complementary angles, supplementary angles, and relates reflex angle measures to degress in a circle. [9:55]
Khan Academy
Khan Academy: Geometry: Complementary and Supplementary Angles
Defines and gives examples of complementary angles, supplementary angles, and adjacent angles. Practice problems available. [8:31]
Khan Academy
Khan Academy: Angles: Complementary and Supplementary Angles
Basics of complementary, supplementary, adjacent and straight angles. Also touching on what it means to be perpendicular.
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: Geometry: Angles (Part 2)
Describes complementary and supplementary angles. Explains how to use properties of complementary and supplementary angles to solve for missing angle measures. Introduces idea that vertical angles (opposite angles) are congruent. [9:05]
Khan Academy
Khan Academy: Angles (Part 2)
Describes complementary and supplementary angles. Explains how to use properties of complementary and supplementary angles to solve for missing angle measures. Introduces idea that vertical angles (opposite angles) are congruent. [9:05]
Math Mammoth
Math Mammoth: Angles in a Triangle Add Up to 180 Degrees: Exercises and Proof
Demonstrates how to solve problems where one angle of a triangle is unknown and how to draw an isosceles triangle with the given properties. This is followed by a proof of the angle-sum theorem. [9:18]
Virtual Nerd
Virtual Nerd: How Do You Find Missing Angles in a Transversal Diagram?
Take a look at this tutorial to see how to find all the missing angle measurements by identifying vertical, corresponding, adjacent, and alternate exterior angles. [4:43]
Virtual Nerd
Virtual Nerd: How Do You Use Supplementary Angles to Find a Missing Angle?
In this tutorial, you'll see how to use your knowledge of supplementary angles to set up an equation and solve for a missing angle measurement. [3:41]
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 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.
Khan Academy
Khan Academy: Geometry: Angles Formed Between Transversals and Parallel Lines
Explains the relationship between the measures of angles formed when parallel lines are cut by a transversal based on relationships of corresponding, vertical, and supplementary angles. [7:53]
Khan Academy
Khan Academy: Geometry: Angles (Part 3)
Identifies and defines the types of angles formed by parallel lines cut by a transversal and the relationship of their measures. Discusses Triangle Sum Theorem. [9:48]
Art of Problem Solving
Art of Problem Solving: Introduction to Angles
Video tutorial uses examples to provide an introduction to angles including right, acute, and obtuse angles. [8:22]
Art of Problem Solving
Art of Problem Solving: Angles in a Triangle Part 2
Video tutorial uses problems to reinforce understanding of angles in a triangle. (Part 2) [6:23]
Art of Problem Solving
Art of Problem Solving: Angles in a Triangle Part 1
Video tutorial uses problems to reinforce understanding that the angles in a triangle always add up to 180 degrees. (Part 1) [3:55]