Difference between revisions of "Numbers and Angles"
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− | <noinclude>{{Manual Page}}[[Category:Manual (official)|{{PAGENAME}}]]</noinclude> | + | <noinclude>{{Manual Page|version=4.0}}[[Category:Manual (official)|{{PAGENAME}}]]</noinclude> |
{{objects|general}} | {{objects|general}} | ||
==Numbers== | ==Numbers== | ||
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{{Note|In GeoGebra, numbers and angles use a period (.) as a decimal point.}} | {{Note|In GeoGebra, numbers and angles use a period (.) as a decimal point.}} | ||
− | You can also use the constant π and the Euler constant e for expressions and calculations by selecting them from the drop down | + | You can also use the constant π and the Euler constant e for expressions and calculations by selecting them from the drop down list next to the Input Bar or by using [[Keyboard Shortcuts]]. |
{{Note|If the variable e is not used as a name of an existing object yet, GeoGebra will recognize it as the Euler constant if you use it in new expressions.}} | {{Note|If the variable e is not used as a name of an existing object yet, GeoGebra will recognize it as the Euler constant if you use it in new expressions.}} | ||
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==Free Numbers and Angles== | ==Free Numbers and Angles== | ||
− | [[Free, Dependent and Auxiliary Objects#Free Objects|Free]] numbers and angles can be displayed as sliders in the Graphics View (see [[Image:Tool Slider.gif]] [[Slider Tool]]). Using the arrow keys, you may change the value of numbers and angles in the [[Algebra View]] too (see | + | [[Free, Dependent and Auxiliary Objects#Free Objects|Free]] numbers and angles can be displayed as sliders in the Graphics View (see [[Image:Tool Slider.gif]] [[Slider Tool]]). Using the arrow keys, you may change the value of numbers and angles in the [[Algebra View]] too (see [[Animation#Manual Animation|Manual Animation]] section). |
===Limit Value to Interval=== | ===Limit Value to Interval=== | ||
Free numbers and angles may be limited to an interval [min, max] by using tab Slider of the Properties Dialog (see also [[Image:Tool Slider.gif]] [[Slider Tool]]). | Free numbers and angles may be limited to an interval [min, max] by using tab Slider of the Properties Dialog (see also [[Image:Tool Slider.gif]] [[Slider Tool]]). | ||
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Revision as of 13:28, 17 February 2011
Numbers
You can create numbers by using the Input Bar. If you only type in a number (e. g., 3), GeoGebra assigns a lower case letter as the name of the number. If you want to give your number a specific name, you can type in the name followed by an equal sign and the number (e. g., create a decimal r by typing in r = 5.32).
You can also use the constant π and the Euler constant e for expressions and calculations by selecting them from the drop down list next to the Input Bar or by using Keyboard Shortcuts.
Angles
Angles are entered in degree (°) or radians (rad). The constant π is useful for radian values and can also be entered as pi.
- Alt + O (Mac OS: Ctrl + O) for the degree symbol °
- Alt + P (Mac OS: Ctrl + P) for the pi symbol π
- If a = 30 is a number, then α = a° converts number a to an angle α = 30°, without changing its value.
- If you type in b = α / °, the angle α is converted back to the number b = 30, without changing its value.
Free Numbers and Angles
Free numbers and angles can be displayed as sliders in the Graphics View (see Slider Tool). Using the arrow keys, you may change the value of numbers and angles in the Algebra View too (see Manual Animation section).
Limit Value to Interval
Free numbers and angles may be limited to an interval [min, max] by using tab Slider of the Properties Dialog (see also Slider Tool).