Looking for one Move (ver 0.2)
- Author:
- math.cohen
- Topic:
- Rotation
You are given two congruent triangles that have the same orientation. Using GeoGebra's tool, build a single rotation that takes the green triangle to the blue triangle.
Before you do anything:
- Why can't the single move be a translation?
- Why can't the single move be a reflection?
- Triangle ABC is the original triangle. See what happens when you change the lengths of the sides on triangle ABC.
- Point D is fixed. You can rotate triangle DEF around D by moving point E.
- Use the mouse to see that triangle DEF is indeed congruent to triangle ABC.
- Use the upper right-hand corner reset icon, so that the triangles are back in their original position.
- Using GeoGebra's tools, find a point and an angle that will define the rotation that takes poly2 to poly1.
- Note that the first angle you define will be called . You can type an alpha by holding the alt key while pushing the a key.
- Make sure that your rotation continues to work when you move