Drawing an Octahedron.

Start the program, right click on the little man and erase him!

Use the pencil tool to draw 6 lines 3 metres long up each of the coordinate axes.

You can use the value entry box (bottom right hand corner of the screen) to type in 3. This should give a 3m long line.

I set metres as the default measurement unit on installation. You can get at the units in the windows/preferences menu.

Select the system preferences menu and pick your favourite units.
The current measurement is displayed in the little box at the bottom RH corner of the screen.

Now Join all the outside edges up to form an octahedron.

You can now use a fill colour to shade in all the faces.

Now construct a point in space at a distance of 10 from the origin along each axis. This point is on the normal through the faces ofthe octahedron. You can find this point by drawing 3 lines, one on each axis.
Join this point to the three corners of triangular face below it.
Once you have joined the 10,10,10 point to the face you can remove the construction lines.

Connect all 8 of the points that are equivalent to 10,10,10 to their facesand colour them in. The result should look like this.