Adding Angles

Explicit instruction/Teacher modeling

• Look over the standard angle measurements with your class and preview the Baseball Field Angles #2 worksheet. Make sure to clarify how terms map to images on the worksheet.
• Note academic vocabulary for the following terms:
  • Angle: The shape of two lines that connect.
  • Point: A single place on a line.
  • Vertices: A place where two lines intersect.
• Demonstrate the first exercise, noting how when two angles are added angles they make a sum. Explain that when the angles are put together, the sum of both angle measurements is equal to one larger angle measurement.

Guided practice/Interactive modeling

• Lead the class through the second exercise, taking care to note how the angles are identified and named.

Independent working time

• Allow students to work in pairs or small groups on remaining exercises.

Support

• Assist with leading questions and redirect students' queries to the angle poster and previous examples.
• Prepare a model of the folded paper angles (using the Folding for Angles worksheet) with angles labeled.

Enrichment

• Students can work in small groups on a poster to present the exercise from the worksheet.

• Circulate the room during independent work time to note student understanding of angle measurements by modeling them with their arms. Students can show added angles by combining their angle with a partner.

• Discuss the exercise from the worksheet. Share student explanations with the class, and be sure to encourage compliments and observations that use geometry terms from the lesson.