You can assign a certain name to an object when you create it using the Input Bar:
- Points: In GeoGebra, points are always named using upper case letters. Just type in the name (e. g., A, P) and an equal sign in front of the coordinates or commands.
C = (2, 4),
P = (1; 180°)
- Vectors: In order to distinguish between points and vectors, vectors need to have a lower case name in GeoGebra. Again, type in the name (e. g., v, u) and an equal sign in front of the coordinates or commands.
v = (1, 3),
u = (3; 90°)
- Lines, circles, and conic sections: These objects can be named by typing in the name and a colon in front of their equations or commands.
g: y = x + 3,
c: (x-1)^2 + (y – 2)^2 = 4,
hyp: x^2 – y^2 = 2
- Functions: You can name functions by typing, for example,
g(x)=in front of the function’s equation or commands.
h(x) = 2 x + 4,
q(x) = x^2, trig(x) = sin(x)
- If you don’t manually assign a name to an object, GeoGebra assigns the names of new objects in alphabetical order.
- You can create indices within the names of objects by using an underscore. For example A1 is entered as
A_1and sAB is entered as
These are the labels you can't use for objects: x, y, xAxis, yAxis, zAxis, abs, sgn, sqrt, exp, log, ln, ld, lg, cos, sin, tan, acos, arcos, arccos, asin, arcsin, atan, arctan, cosh, sinh, tanh, acosh, arcosh, arccosh, asinh, arcsinh, atanh, arctanh, atan2, erf, floor, ceil, round, random, conjugate, arg, gamma, gammaRegularized, beta, betaRegularized, sec, csc, cosec, cot, sech, csch, coth
In the symbol list of the input bar, you will find special characters for the following constants:
- π - the circle constant pi, which you can also type with <Alt>p
- ℯ - the Euler number, e.g. for the exponential function ℯ^x, which you can also type with <Alt>e
- ί - the imaginary unit, e.g. for complex numbers like z = 3 + ί, which you can also type with <Alt>i
When the variable names e and i are not used yet, they are automatically read as ℯ and ί respectively for convenience.
See also Labels and Captions.