Polar coordinates are entered using a semi-colon: e.g. [b](3;pi/3)[br][br][/b]The default angle measure is degrees. This can be changed in [b]Settings > Graphing [/b](cubic icon).[br][br]Polar curves can be entered directly: e.g. [b]r=3+2cos(θ)[br][/b]NB GeoGebra will plot negative values of r.[br][br]You can also use the command [b]Curve[(r;[b]θ[/b]),[b]θ[/b],start value, end value][br][/b]e.g. [b]Curve[(2 + sin(θ/2); θ), θ, 0, 4pi][/b]