Lesson plan

What’s Your Angle?

Obtuse, acute, and right angles, oh my! In this hands-on lesson, students will learn about different kinds of angles through motion. Mastering this pre-geometry skill will help kids tackle advanced math as they get older.
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  • Students will know what creates an angle and the different types of angles.
(10 minutes)
  • Introduce the concept of angles. Tell students that angles are made up of two rays with a common endpoint.
  • Create a chart of angles, including their measurements and drawings to illustrate their shape. This can be done on a whiteboard, projector, or using an interactive whiteboard. The should include right angles(90˚), obtuse angles(greater than 90˚), acute angles(less than 90˚), and straight angles(180˚).
  • This is will be the students' point of reference during the game.
(5 minutes)
  • Explain the rules of the game. Tell students that you will be calling out names of angles, and you want them to reply by creating the shape of the angle with their arms, followed by them naming the degrees.
  • Demonstrate to the class how you would like this done. For example: Say "right angle" and make your arms into an "L" shape. Finish by saying "90 degrees!"
  • This can be repeated for all four kinds of angles, if necessary.
(10 minutes)
  • Ask for two volunteers. Explain that these two will demonstrate how two people can play the game together.
  • Have your volunteers play the game while you help guide them through any confusion. One person should be the "caller" of each angle. The other person will create the angle with their arms, and call out the angle degrees.
  • Ask if any of your students need clarification or have any questions.
  • Play the game with the whole class.
(15 minutes)
  • Separate your class into pairs.
  • Tell students you will be playing again, and that they will have the chance to both call names of angles as well as model the shapes and name the degrees.
  • Allow each side to call and respond for five minutes.
  • As the game is being played, walk around to check student understanding and to ensure that they're on task.
  • Enrichment: Give students who need more of a challenge index cards with drawings of angles and let them measure and name the angles.
  • Support: Pair students who need extra help with students who have a strong understanding of the material. You could also play the game with the student one-on-one or provide index cards with labelled angles as a reference.
  • An interactive whiteboard could be used to draw the chart.
(15 minutes)
  • Pass out a copy of the Identifying Angles worksheet to each student. They will complete this to demonstrate their understanding of different kinds of angles.
(10 minutes)
  • Bring students together to remind them that angles are created when two rays share a common endpoint.
  • Refer to your chart to emphasize the names of angles and their corresponding degrees.
  • Point out examples of angles around the classroom, and encourage the class to do the same. For example, you could point out that the corners of a window create a 90 degree angle.

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