# Interior and Exterior Angles of a Triangle Rating

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The authors Chris S.

## Basics on the topicInterior and Exterior Angles of a Triangle

After this lesson you will be able to identify the types of angles on a triangle, and use their properties to find missing angle measurements.

The lesson begins by identifying the different types of angles on a triangle. It then uses the definition of supplementary angles to find the relationships between these angle types. It concludes with an application of the Angle Sum Theorem.

Learn about the angles of a triangle by helping Moira create a mosaic to beautify her city!

This video includes key concepts, notation, and vocabulary such as: interior angle (an angle on the inside of a shape, formed between two sides); exterior angle (an angle outside of a shape, formed using one side of the shape); adjacent angles (two interior/exterior angles that are next to each other); vertical angle (an angle outside the shape, opposite an interior angle); supplementary angles (angles that sum to 180 degrees); and the Angle Sum Theorem (the sum of the interior angles of a triangle is equal to 180 degrees).

Before watching this video, you should already be familiar with triangles and supplementary angles.

After watching this video, you will be prepared to solve more advanced missing angle problems involving other geometric shapes, lines, and transversals.

Common Core Standard(s) in focus: 8.G.A.5 A video intended for math students in the 8th grades Recommended for students who are 13-14 years old