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IM Geo.3.15 Lesson: Finding All the Unknown Values in Triangles

Auteur :GeoGebra Classroom Activities, IM Algebra 1, Geometry, Algebra 2

Which one doesn’t belong?

AB

CD




Your teacher will give you either a problem card or a data card. Do not show or read your card to your partner.

If your teacher gives you the data card:If your teacher gives you the problem card:

  1. Silently read the information on your card.
  2. Ask your partner “What specific information do you need?” and wait for your partner to ask for information. Only give information that is on your card. (Do not figure out anything for your partner!)
  3. Before telling your partner the information, ask “Why do you need to know (that piece of information)?”
  4. Read the problem card, and solve the problem independently.
  5. Share the data card, and discuss your reasoning.

  1. Silently read your card and think about what information you need to answer the question.
  2. Ask your partner for the specific information that you need.
  3. Explain to your partner how you are using the information to solve the problem.
  4. When you have enough information, share the problem card with your partner, and solve the problem independently.
  5. Read the data card, and discuss your reasoning.

Do not show or read your card to your partner.

Triangle ABC is similar to triangle A'B'C'.

 Give reasonable measurements for all 3 sides of triangle . Explain your reasoning.

Find or make a square piece of paper. You can also use the applet below.

Fold the bottom left corner to the midpoint of the top edge. Label a point  at the midpoint of the segment created on the right edge, . Prove  is  of the way down the whole side of the square.

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