When you press the start button the top corner of the triangle begins to move on the outline of the circle.

- What can you say about all the triangle edges originating in the center of the circle?
- Which type are both the triangles - the red and the blue one?
- Compare the two red arcs to each other. Do the same for the blue ones.
- Consider the triangle composed of the red and the blue triangle. Set up the formula for the sum of angles of the combined triangle.
- Calculate the sum of one blue and one red angle.
- Which type is the combined triangle?