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