In the previous tutorials in the GeoGebra Essentials Series, we have discussed how to construct mathematical objects such as points, lines, line segments, circles and other mathematical objects using the mouse and the tools in the Toolbar. In this post, we learn how to construct these objects using keyboard commands. In particular, we are going to create an equilateral triangle.
Step by Step Instructions
In this post, we create equilateral triangle ABC. The construction is very similar to GeoGebra Tutorial 2 – Constructing an Equilateral Triangle.
1.) Open GeoGebra. Select Algebra & Graphics in the Perspective panel to open the Algebra & Graphics window.
2.) To plot point A with coordinates (1,1), type A = (1,1) in the Input Bar and then press the ENTER key on your keyboard. Now plot B = (5,1).
3.) To construct segment AB, type segment[A,B].
4.) To construct a circle with center A and passing through B, type circle[A,B]. Now, construct a circle with center B passing through A.
5.) Now, to intersect the two circles, type intersect[c,d]. The names c and d are the name given by GeoGebra to the two circles (see Algebra view). Names, usually small or capital letters, are given to each object in GeoGebra. Do not confuse the names with equations.
6.) Next, to polygon ABC, type polygon[A, B, C].
7.) Now, hide the circles and point D by right clicking them and clicking Show Object and we are done. As we can see, we cannot do everything using keyboard commands.