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Classify Angles

Classify Angles. Vocabulary. The vertex is the point where the two rays meet. Right angle : an angle that measures 90° Acute angle : an angle that measures less than 90° Obtuse angle : an angle that measures greater than 90° Straight angle: an angle that measures exactly 180°. Vocabulary.

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Classify Angles

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  1. Classify Angles

  2. Vocabulary • The vertex is the point where the two rays meet. • Right angle: an angle that measures 90° • Acute angle: an angle that measures less than 90° • Obtuse angle: an angle that measures greater than 90° • Straight angle: an angle that measures exactly 180°

  3. Vocabulary • Vertical angles: two angles are vertical if they are opposite angles formed by the intersection of two lines. Vertical angles are congruent or have the same measure. • Adjacent angles: two angles are adjacent if they share a common vertex, a common side, and do not overlap.

  4. Types of Angles

  5. Vertical Angles

  6. Adjacent angle pairs

  7. Example 1: *You can name an angle by its vertex and by its points. Name the angle and then classify it as acute, right, obtuse or straight.

  8. Practice: Name each angle in four ways. Then classify each angle as acute, right, obtuse, or straight.

  9. Practice: Name each angle in four ways. Then classify each angle as acute, right, obtuse, or straight.

  10. Practice: Name each angle in four ways. Then classify each angle as acute, right, obtuse, or straight.

  11. Example 2: Identify a pair of vertical angles and adjacent angles in the diagram at the right. Justify your response.

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