### 4.2.1. Numbers and Angles

Numbers and angles use the sign “.” as decimal point.

Example: You get a number r by typing in r = 5.32.

Note: You can also use the constant π and the Euler constant e for expressions and calculations by selecting them in the drop down menu next to the input field.

Angles are entered in degree (°) or radian (rad). The constant π is useful for radian values and can also be entered as pi.

Example: An angle α can be entered in degree (α = 60) or in radian (α = pi/3).

Note: GeoGebra does all internal calculations in radian. The symbol ° is nothing but a constant for π/180 to convert degree into radian.

Related Topics

4.2. Direct Input
Sliders and Arrow Keys
Limit Value to Interval

www.geogebra.org