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Entering polar coordinates and curves

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