Supplementary Angles

Supplementary angles are a pair of angles whose measures add up to 180 degrees. When two angles are supplementary, it means that when you add their measures together, the result is 180 degrees.

Properties of Supplementary Angles:

1. Supplementary angles form a straight line when placed adjacent to each other.
2. Each angle in a pair of supplementary angles is the supplement of the other angle.
3. If the sum of two angles is 180 degrees, then they are supplementary.

Examples of Supplementary Angles:

Here are a few examples of pairs of supplementary angles:

• Angle A = 120 degrees, Angle B = 60 degrees (120° + 60° = 180°)
• Angle X = 90 degrees, Angle Y = 90 degrees (90° + 90° = 180°)
• Angle P = 150 degrees, Angle Q = 30 degrees (150° + 30° = 180°)

How to Identify Supplementary Angles:

To identify if two angles are supplementary, simply add their measures. If the sum is 180 degrees, then the angles are supplementary. If the sum is not 180 degrees, then the angles are not supplementary.

Study Guide:

Here are some key points to remember about supplementary angles:

1. Supplementary angles add up to 180 degrees.
2. Supplementary angles are always in a pair.
3. When two angles are supplementary, it means they form a straight line when placed adjacent to each other.

Remember to practice identifying and working with supplementary angles to reinforce your understanding of this concept.

Now that you have a good understanding of supplementary angles, you can move on to practicing problems and applying this knowledge to geometry problems. Good luck!

[Supplementary Angles] Related Worksheets and Study Guides:

• AnglesMathematics • Fifth Grade
• Lines and AnglesMathematics • Fourth Grade