## 2.1. Triangle with Angles

Select mode New point in the toolbar. Click three times on the drawing pad to create the three vertices A, B, and C of the triangle.

Afterwards, select mode Polygon and successively click on points A, B, and C. To close triangle poly1 click on the starting point A again. In the algebra window the area of the triangle is shown.

In order to get all the angles of a triangle, choose mode Angle in the toolbar and click on the triangle.

Now, choose Move mode and drag the vertices to modify the triangle dynamically. If you don't need the algebra window and coordinate axes, hide them by using the View menu.

Related Topics

2. Examples

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