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Angles

Angles. Ms. Henson’s 4 th Grade Class. Learning Objectives. The student will analyze and measure angles using a protractor. The student will identify angles as right angle, acute angles, and obtuse angles. The student will build and draw right, acute, and obtuse angles. What is an angle?.

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Angles

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  1. Angles Ms. Henson’s 4th Grade Class

  2. Learning Objectives • The student will analyze and measure angles using a protractor. • The student will identify angles as right angle, acute angles, and obtuse angles. • The student will build and draw right, acute, and obtuse angles.

  3. What is an angle? Two rays with a common endpoint form an angle.

  4. The meeting point of two lines or two rays is called the vertex. Vertex

  5. Angles are measured in units called degrees. A protractor is the tool we use to measure angles in degrees. 120° Degree Sign

  6. Angles Foldable Materials Needed: • Colored Paper • Markers • Scissors

  7. An angle that measures less than 90° An angle that measures exactly 180° An angle that measures exactly 90° An angle that measures more than 90° Acute Angles Straight Angles Types of Angles Right Angles Obtuse Angles

  8. Naming and Measuring Angles https://www.brainpop.com/math/geometryandmeasurement/angles/

  9. Your turn • Measure each angle on your worksheet using your protractor. • Label each angle with the measurement (in degrees) • Identify each angle as an acute, right, obtuse, or straight angle.

  10. Reach for the Stars • Draw 3 triangles. • How many angles are in each triangle? • Measure the angles of each triangle and add together to get a total in degrees. • What do you notice about the total for each triangle?

  11. Ticket Out the Door • Use your protractor to draw the 4 different types of angles we learned today. • Label each angle with their name and degree measurement.

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