Assembling a Triangle - SAS #1
Triangle from Side-Angle-Side

A triangle is completely determined if we know 2 "sides" and the size of the angle between them. There are 2 "sides" and an angle on the drawing pad.
Let's assemble the triangle!

First - click on Goal button to see our goal (hang-on a bit, sometimes it takes it a few seconds)
and then click on Reset to start.

Start: Assemble the triangle with the given sides and angle.

-Click and drag point A onto the vertex of the angle. Then click and drag point B so that the side AB lies on the lower ray of the angle.

- Click and drag point A1 onto the vertex of the angle. Then click and drag point C so that the side AC lies on the upper ray of the angle.

Now, notice that the length of the side BC is fixed. There are no extra possibilities

- Select the 'Segment between two points' tool and click on B and C to complete the triangle.

- Now click again on the Reset to start over.

- Select the 'Move' tool. Click and drag the sliders to whatever values you want and follow the instructions from Start again.

End: Notice that once you make the triangle you cannot use the angle slider. Why is this?

In the next exercise, you will construct a triangle using SAS - not just assemble. Then everything will work properly. Click on the Next button to go to this exerise.

 Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and activated. (click here to install Java now)

Author: LFS, Created with GeoGebra