<![CDATA[Rounding and Angles]]>
https://help.geogebra.org/topic/rounding-and-angles
Fri, 20 Sep 2019 16:49:53 +0000Fri, 20 Sep 2019 11:19:07 +0000Zend_Feed<![CDATA['Round' rounds the numbers in the unit tey are stored to the unit. So if an angle is shown in degrees, degrees will be rounded, no radians. If the algebra view displays angles as degrees this means that the settings for angles is in degrees (Options - Advanced) so it's normal that degrees will be rounded. If you want to work and round radians you have to change the settings. chris]]>
https://help.geogebra.org/topic/rounding-and-angles#comment-268086
Fri, 20 Sep 2019 14:01:58 +0000<![CDATA[The algebra view displays angles as degrees. So does the round function round to the nearest degree (even though the value is stored internally in radians)?]]>
https://help.geogebra.org/topic/rounding-and-angles#comment-268080
Fri, 20 Sep 2019 13:42:53 +0000<![CDATA[Just did some tests and it rounds numbers up or down to the nearest whole number. But what does it do with angles?]]>
https://help.geogebra.org/topic/rounding-and-angles#comment-268068
Fri, 20 Sep 2019 11:26:12 +0000<![CDATA[How do I access Options Chris? My menu has "settings" which allows me to change number of decimal place etc. Properties for an angle object has an advanced tab but there isn't an option to change degrees to radians there.]]>
https://help.geogebra.org/topic/rounding-and-angles#comment-268088
Fri, 20 Sep 2019 14:12:13 +0000<![CDATA[I think I have it. It's under the "Algebra" settings window.]]>
https://help.geogebra.org/topic/rounding-and-angles#comment-268090
Fri, 20 Sep 2019 14:14:51 +0000<![CDATA[However the trig functions as I understand it take a radian argument, so if angles are displayed in degrees, they need to be converted to radians first to do any calculations?]]>
https://help.geogebra.org/topic/rounding-and-angles#comment-268092
Fri, 20 Sep 2019 14:20:56 +0000<![CDATA[this is a matter of users interface and internal programming, but this is the same for any calculator in which you can choose different modi. For the user the calculations are made in the chosen modus. That's the same with trigonomic functions. If the chosen modus is degrees, you will find: cos (60) = 0.5 cos (60 rad) : -0.95 cos (60°) = 0.5 This illustrates that GeoGebra remembers the chosen settings and functions are calculated in this chosen modus. What happens internally is another question, that's a matter of conversion between internal calculations and users interface which indeed will require some conversions. Fortunately this is solved by developers chris]]>
https://help.geogebra.org/topic/rounding-and-angles#comment-268098
Fri, 20 Sep 2019 15:57:23 +0000<![CDATA[Ok, but in my case I have a slider whose value is degrees and is used as the argument for sin and cos. I have to convert the value to radians for the calculations to work. That of course is because the value of the slider is a number, not an angle.]]>
https://help.geogebra.org/topic/rounding-and-angles#comment-268106
Fri, 20 Sep 2019 16:32:11 +0000<![CDATA[Hmm, but I just discovered now that a slider can be an angle value. That makes more sense. No need to do conversions!]]>
https://help.geogebra.org/topic/rounding-and-angles#comment-268110
Fri, 20 Sep 2019 16:50:07 +0000