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.
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Angles on a Straight Line Worksheet (find unknown angles)
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