Triangle with side and angle measurements

In this construction, we make a triangle, mark its angles, then display the measurements of its sides and angles. Click the icon on the right to open the sample file. Follow the suggested steps below to make your own construction.

060504b1_worksheet.ggb

			Step 1 Make a triangle

Choose the mode "Polygon" from the toolbar (click on the small arrow at the third icon from the left). Now click on the drawing pad 3 times to create the vertices A, B, and C. Close the triangle by clicking on A again.

			Step 2 Mark its angles

Choose the mode "Angle" in the toolbar. Click the triangle interior once and its 3 angles will be marked. By default, names of these angles are also displayed. This mode can also create the angle defined by 3 points; between 2 segments/lines or vectors. Check the help file.

			Step 3 Edit one of the angles

Right click at one of these angles and choose "Properties" in the contextual menu. The following window will be opened.

You may choose to display the "value", i.e., the measurement, instead of the name of this angle. Try other formatting, such as color, size (of the arc), line thickness, etc. The third check box indicate whether reflex angle will be shown.

			Step 4 Edit other angles

Choose the mode "Copy visual style". Click on the angle that you have just edited. The properties of this angle will be copied. Then click on other angles and the same set of properties will be adopted.

			Step 5 Edit the sides

Do the similar editing for the sides of the triangle. Right any one of these sides to open the "Properties" dialog window from the contextual menu. "Value" of the segment can be displayed. Copy the properties to other segments afterwards.

The segment c is selected and being edited. Instead of copying the properties, you may also click other objects on the left panel to edit them one by one.