Class Agenda #4

Opener: Interquartile Mean

SLT Triangles 1: I can use similarity to define trigonometric ratios as properties of the angles in a triangle.

The Similar Triangles Project, Part 2:

  • Use everyone’s empirical data from Part 1 of this project to determine your theoretical value for each of the ratios: a/e, b/e, and a/b.
  • When your group is satisfied with the values of your ratios, add them to the chart on the board.

How do you know if your theoretical values are accurate?

  • What are the properties of similar triangles?
  • Let’s measure the angles in each of our triangles.
  • Let’s use these angles to check out answer.

In conclusion:

  • The trigonometric ratios are SINE, COSINE, and TANGENT

  • These ratios are properties of the angles in similar triangles.

  • So, are rectangles and squares similar?

Next Step: “A Fascinating Chart

The Similar Triangles Project is due on Wednesday, February 13.  Click here to see all parts of the project.

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