Class Agenda #11: Brainiacs

Student Learning Targets

  • Habit 4: I can construct mathematical models.
  • Habit 5: I can make strategic use of appropriate tools.
  • Triangles 4: I can use special triangles to determine geometrically the values of sine, cosine and tangent for angles of 0, 30,45, 60 and 90 without a calculator.


  • Construct an equilateral triangle using your compass and straightedge. (Hint: No measurements!)
  • How can you divide your equilateral triangle into 2 smaller triangles?

Now, let’s do some constructions on GeoGebra. 

  • Equilateral Triangle —> “Special” Triangles


  • Handout: Problem Set #5, due Thursday at 3:30 pm.
  • Delta Math: Exercises for SLT T3 (Second Chance)
    • Finish 100% to earn a 3
    • Due by 11:59 pm on Sunday March 3.
  • Play with Geogebra and learn something (download from

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