Oriented circular (central) arc, arrowhead showing the direction of rotation.
Tool (.ggt): [url]http://www.geogebratube.org/material/show/id/65947[/url]
[math]\;\;\;[/math]ArcArrow1[A,B,C, λ]
Return the (signed) angle of the same arc
Construction: [url]http://www.geogebratube.org/material/show/id/99837[/url]
Tool (.ggt): [url]http://www.geogebratube.org/material/show/id/99838[/url]
[math]\;\;\;[/math]Angle2[B,A,C]
