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6th Grade Math

There are six sets of angle worksheets:

- Angles on a Straight Line
- Angles at a Point
- Vertical Angles
- Complementary Angles
- Supplementary Angles
- Complementary & Supplementary Angles

Examples, solutions, videos, and worksheets to help grade 6 learn how to find unknown angles that are on a straight line.

In geometry, when two or more angles share a common vertex and a common side and are positioned in such a way that they form a straight line, those angles are said to be “angles on a straight line” or “linear angles.” Linear angles always add up to 180 degrees because they together form a straight line, which is a half-turn or 180-degree rotation.

For example, if you have three angles, ∠A, ∠B, and ∠C that share a common vertex and side and are positioned in a straight line, you can say:

∠A + ∠B + ∠C = 180 degrees

This property is also known as the “straight angle property.” It is often used to solve problems involving angles in geometry. It can be used to find unknown angles on a straight line.

Have a look at this video if you need to review how to find unknown angles in a straight line.

Click on the following worksheet to get a printable pdf document.

Scroll down the page for more **Angles on a Straight Line Worksheets**.

**Printable**

(Answers on the second page.)

Angles on a Straight Line Worksheet (find unknown angles)

**Online**

Types of Angles

Angles in a Straight Line

Angles at a Point

Complementary Angles

Supplementary Angles

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