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...

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.

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...

Investigate algebraic applications of complementary angles. Young scholars watch as the instructor describes and defines complementary angles. He then shows an example of finding an unknown value of x given expressions for a pair of...

A straightforward lesson explains the meaning of complementary and supplementary angles. The instructor uses both an algebraic representation and a numeric example to describe each angle pair.

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...

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...

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...

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...

A motivating activity is coupled with the use of algebra to explore the process of identifying the value of an angle. It feels like magic when Sal shows the solution to the final problem. Also, it would be worthwhile to consider using...

How do you determine the size of an angle? Pupils learn about degrees and how to measure the size of an angle. The video associates the measurements to types of angles such as acute, obtuse, and right. The additive properties of angle...

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...

The second video in the series on angles explores the concept of supplementary and complementary angles. It also explains intersecting lines and opposite angles.

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...

Complement the class by identifying pairs of angles. With a vocabulary lesson, pupils learn the names and definitions of special angle pairs including adjacent, vertical, complementary, supplementary, and linear pairs. Using the...

Pupils review the vocabulary, formulas, and postulates from the opening unit in Geometry. Individuals use these to solve a problem set that requires learners to apply algebraic skills along with providing reasons within a proof. Scholars...

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...

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]

View this tutorial to see how to use what you know about complementary angles to find a missing angle measurement. [3:20]

Sal solves a problem about a submerged pyramid using the fact that the sine of an angle is equal to the cosine of its complementary angle.

Sal shows that the sine of any angle is equal to the cosine of its complementary angle.

Sal solved the following problem: Given that cos(58 degrees)=0.53, find sin(32 degrees).

Defines an angle, complementary angles, supplementary angles, and relates reflex angle measures to degress in a circle. [9:55]

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]