<![CDATA[Graph Forums — calculate area and perimeter of circle]]> https://forum.padowan.dk/viewtopic.php?id=1112 Sun, 18 Nov 2018 12:18:18 +0000 PunBB <![CDATA[Re: calculate area and perimeter of circle]]> https://forum.padowan.dk/viewtopic.php?pid=3234#p3234 Unfortunately Graph cannot do calculations on relations, so you have to use a parametric function instead.

If your circle is centered at (0,0), you can use a polar function. For example r(t)=5 will plot a circle with radius 5. If you want to calculate the area of the whole circle you can use Calc|Area with From=0 and To=2pi. Likewise if you want to calculate the whole perimeter you can use Calc|Length of path with From=0 and to=2pi.

]]> Sun, 18 Nov 2018 12:18:18 +0000 https://forum.padowan.dk/viewtopic.php?pid=3234#p3234 <![CDATA[calculate area and perimeter of circle]]> https://forum.padowan.dk/viewtopic.php?pid=3233#p3233 I am having an issue calculating the area and perimeter of a circle.
I drew a circle through "relation". Is that the problem?
Even when drawing through "parametric function" I am having issues.
Any help would be greatly appreciated! (especially when drawing through "relation" as I find that more simple).

]]> Sun, 18 Nov 2018 09:36:41 +0000 https://forum.padowan.dk/viewtopic.php?pid=3233#p3233