Straight Angle

A straight angle is an angle that measures 180 degrees. It forms a straight line and is represented by a straight line with two rays extending from a common point. The two rays that form a straight angle are opposite and collinear, meaning they lie on the same line.

Properties of a Straight Angle:

1. Measures 180 degrees

2. Forms a straight line

3. Opposite rays are collinear

Examples of Straight Angles:

Example 1: A line segment AB with a ray AC and a ray CB extending from the common point C forms a straight angle at point C.

Example 2: A straight line PQ with a ray PR and a ray RQ extending from the common point R forms a straight angle at point R.

Study Guide:

When studying straight angles, it's important to understand the following key points:

1. Identifying straight angles in geometric figures
2. Understanding the properties of straight angles
3. Measuring and drawing straight angles accurately
4. Applying the concept of straight angles in solving problems and real-life scenarios

Practice drawing and identifying straight angles in different geometric shapes to reinforce your understanding of this concept.

Remember, a straight angle is a fundamental concept in geometry and serves as the basis for understanding various angle properties and relationships.