# GeoGebra (dynamic geometry)

Explore GeoGebra by testing buttons and using the help file. Use this information to describe what the following icons do and answer questions below. Be prepared to discuss answers in class.

or

What does the mouse wheel do?

What does the little circle next to things in the "Algebra" view (on left) do?

Practice constructions (choose one):

- Construct a right triangle that remains a right triangle under distortion. Changing the length of one leg should not affect the length of the other leg.
- Construct an isoceles trapezoid that remains an isoceles trapezoid under distortion.
- Construct a square that remains a square under distortion.
- Create a sketch that illustrates the sum of angles in a triangle is always 180 degrees. The sketch should allow a student to drag any vertex and
*easily* see that the sum is constant.

## Resources