# Vertical Angles

## Two congruent, non-adjacent angles formed by intersecting lines.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Vertical Angles

by CK-12 //basic
Solve vertical angle problems.
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## Vertical Angles Principles - Basic

by CK-12 //basic
This video provides the student with a walkthrough on identifying vertical angles.
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## Vertical Angles Examples - Basic

by CK-12 //basic
This video provides the student with a walkthrough of one or more examples from the concept "Vertical Angles".
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## Proof - Vertical Angles are Equal

by CK-12 //basic
Proves that vertical angles are equal.
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## Complementary, Supplementary, and Vertical Angles

by CK-12 //basic
Defines types of angles and goes over some practice problems.
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## Angle Relationships and Types of Triangles

by CK-12 //basic
Explains angle relationships and different types of triangles.
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## Vertical Angles - Overview

by CK-12 //basic
Overview
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## Vertical Angles - Example 1

by CK-12 //basic
Find the measure of an angle using the vertical angle
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## Vertical Angles - Example 2

by CK-12 //basic
Find the measure of angles formed by intersecting lines
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## Vertical Angles - Example 3

by CK-12 //basic
Find the measure of angles formed by intersecting lines (multi-step)
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