# Différences entre versions de « Tutoriel:Champ de Saisie »

## Tips and Tricks

• Name a new object by typing name = into the input bar in front of its algebraic representation.
Exemple: P = (3, 2) creates point P.
• Multiplication needs to be entered using an asterisk or space between the factors.
Exemple: a*x or a x
• GeoGebra is case sensitive! Thus, upper and lower case letters must not be mixed up.
• Points are always named with upper case letters
Exemple: A = (1, 2)
• Vectors are named with lower case letters
Exemple: v = (1, 3)
• Segments, lines, circles, functions… are always named with lower case letters.
Exemple: circle c: (x – 2)^2 + (y – 1)^2 = 16
• The variable x within a function and the variables x and y in the equation of a conic section always need to be lower case.
Exemple: f(x) = 3*x + 2
• If you want to use an object within an algebraic expression or command you need to create the object prior to using its name in the input bar.
• y = m x + b creates a line whose parameters are already existing values m and b (e.g. numbers / sliders).
• Line[A, B] creates a line through existing points A and B.
• Confirm an expression you entered into the input bar by pressing the Enter key.
• Open the help window for using the input bar and commands by selecting Help from the Help Menu (or shortcut F1).
• Error messages: Always read the messages – they could possibly help to fix the problem!
• Commands can be typed in or selected from the list next to the Input Bar.
Hint: If you don’t know which parameters are required within the brackets of a certain command, type in the full command name and press key F1 to open the GeoGebra Wiki.
• Automatic completion of commands: After typing in the first two letters of a command into the Input Bar, GeoGebra tries to complete the command.
• If GeoGebra suggests the desired command, hit the Enter key in order to place the cursor within the brackets.
• If the suggested command is not the one you wanted to enter, just keep typing until the suggestion matches.
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