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Measuring angles

This guide covers the fundamentals of measuring angles formed by two rays with a common endpoint, known as the vertex. Angles are measured in degrees using a protractor. There are various types of angles: an acute angle measures less than 90º, a right angle measures exactly 90º, an obtuse angle measures more than 90º but less than 180º, and a straight angle measures exactly 180º. Understanding these concepts is essential for geometry and real-world applications.

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Measuring angles

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  1. Measuring angles

  2. Angle: formed by two rays with common endpoint • The rays are the sides of the angle • The endpoint is the vertex of the angle

  3. Notation • 3 Ways • Vertex (least preferred) • A number • A point on each ray and the vertex (vertex must be in the middle)

  4. Example 1

  5. Measuring angles Angles are measured in degrees using a protractor

  6. Types of Angles • Acute angle: measure is less than 90º but greater than zero

  7. Right Angle: Measure is exactly 90º

  8. Obtuse angle: Measure is greater than 90º but less than 180º

  9. Straight Angle: Measure is exactly 180º

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