Angles Ms Hensons 4 th Grade Class Learning

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? Two rays with a common endpoint form an angle.

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

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

Angles Foldable Materials Needed: q Colored Paper q. Markers q. Scissors

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

Naming and Measuring Angles https: //www. brainpop. com/math/geometryand measurement/angles/

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.

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?

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.