Lesson 6

Live Soap Bubbles

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
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TIMS Task

  1. A right triangle. If two angles equal 90° the third angle will also be 90°. If a triangle has a 90° angle it is a right triangle.
    1. 85°; 60 + 35 + n = 180;
      95 + n = 180; n = 85°
    2. 40°; 65 + 75 + n = 180;
      140 + n = 180; n = 40°
  3. Both angles are 47°.

R. Triangles and Angles

  1. I am a shape with 3 sides and 3 angles. The sum of two of my angles is equal to 90°. What kind of triangle am I? Explain how you decided.

  1. What is the measurement of the missing angle? Write a number sentence to show how you solved each problem.
  2. The two missing angles have the same measurement. What is it?