CK-12 Foundation
Supplementary Angles: Lesson
Supplement your knowledge of angles. Part of a playlist exploring geometry concepts, an interesting video introduces the definition of supplementary angles. Using the definition, the presentation shows how to find the supplement to a...
CK-12 Foundation
Complementary Angles: Lesson
Complement the angle definition. The resource, a video within a basic geometry playlist, introduces the definition of complementary angles. Using the definition, the presentation finds complements of given angles.
Math Antics
Angle Basics
Take a linear approach to acquaint the class with angles. The video introduces the idea of angles from the notion of intersecting lines. Using the idea of perpendicular lines, the resource defines right, acute, and obtuse angles...
Curated OER
What are Complementary Angles?
Supplementary, obtuse, acute, complementary angles. It's good to know what all of these mean, but let's focus on one at a time. Complementary angles always add up to 90 degrees. So if given one angle in a complementary angle problem, the...
Corbett Maths
Angles: Right Angle
The right measure is often hard to find. Given a diagram of two angles that make up a right angle and one of their measures, scholars learn how to find the other angle measure. They watch a video that explains the process and covers a...
Socratica
Complementary, Supplementary, and Vertical Angles
You're such a great resource, said the complementary angle. A short video in the Socratica Geometry playlist describes complementary, supplementary, and vertical angles. It also shows how to calculate the other angle in a supplementary...
Curated OER
How Do You Find a Missing Angle in a Right Triangle?
The triangle sum theorem states that the interior angles of a triangle add up to 180 degrees. So it seems logical that if there are two known values given for the interior angles of a triangle, the third value could be found using this...
Curated OER
How Do You Find Missing Angles in an Isosceles Triangle Using Right Triangles?
Given an isosceles triangle, and the value of one angle, find the missing values. There are some special properties about isosceles triangles. Use the triangle sum theorem to solve this problem. Watch this video to see how the instructor...
Curated OER
How Do You Use Complementary Angles to Find a Missing Angle?
Are complementary angles nice to each other? That's not what complementary means in math. Complementary angles are two angles that add up to 90 degrees and form a right triangle. So if given one value in a problem about complementary...
Curated OER
How Do You Find the Probability of a Complement and a Probability for Consecutive Years?
Probability, place, and time. There is a lot going on in this real-world word problem. I highly recommend watching this video to see how the instructor sorts out and sets up all the information to solve this problem. Take notes and pay...
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]
Math TV
Math tv.com: Trigonometric Functions: Angles, Degress, and Special Triangles
Students learn about the notation and vocabulary associated with angles and triangles. The learning resource consists of a video tutorial and a worksheet with practice problems. In the left hand menu, click Trigonometry, Trigonometric...
Khan Academy
Khan Academy: Geometry: Identifying Complementary and Supplementary Angles
Shows how to identify complementary and supplementary angles in a diagram. [2:36]
Khan Academy
Khan Academy: Angles: Identifying Complementary and Supplementary Angles
Identifying Complementary and Supplementary Angles
Planet Nutshell
Planet Nutshell: Math Shorts: Finding Unknown Angles
Planet Nutshell Math Shorts provide animated videos that explain various math topics. On this site students learn about finding unknown angles by using various angle relationships.
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]
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: 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: 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]
Sophia Learning
Sophia: Angles From Ratios and Algebraic Expressions
Explore how to determine the angle measurement of supplementary and complementary angles with ratios and algebraic expressions in the video tutorial. [6:05] Assess knowledge with a quiz.