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 A_{1} 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.

Author: LFS, Created with GeoGebra