You can enter an object into the worksheet either by using a tool or by entering a command in the input bar. Right of the input bar, there is a menu of all commands. When it comes to points, you don't need a command. Try entering following in the input bar:
GeoGebra differentiates between capital and lower case letters; it uses the naming convention that:
if the first letter is capital, a point is created
if the first letter is lower case, a vector is created
A vector has a length and a direction but it has no position. Note that you can move a vector in a work sheet without changing its coordinates.
Sometimes you want to use the x- or the y-coordinate of a point. If you have a point called A, you can find the x-coordinate and the y-coordinate respectively by writing
These coordinates can be used when making new points. As an example you can enter
B=(x(A),y(A)+1) in the
There are several variants of the commands
Vector. These commands can be used to
make conversions between points and vectors.
For more information about vectors, see Linear Algebra - Vectors.
Instead of using Cartesian coordinates, it is possible to use polar coordinates. This is what the next page is about.
by Malin Christersson under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 Sweden License