| Radical | HGeometry.Number.Radical |
| radius | HGeometry.Ball.Class, HGeometry.Ball |
| randomConvex | HGeometry.Polygon.Convex.Random |
| randomMonotone | HGeometry.Polygon.Monotone |
| randomMonotoneDirected | HGeometry.Polygon.Monotone |
| randomNonZeroVector | HGeometry.Polygon.Monotone |
| range | HGeometry.Viewport |
| rangeQuery | HGeometry.RangeTree.Base, HGeometry.RangeTree |
| RangeTree | HGeometry.RangeTree.Base, HGeometry.RangeTree |
| RArrow | Ipe.Attributes, Ipe |
| RArrowSym0 | Ipe.Attributes, Ipe |
| rawCameraNormal | HGeometry.Graphics.Camera |
| rawViewUp | HGeometry.Graphics.Camera |
| readAll | Ipe.FromIpe, Ipe |
| readAllFrom | Ipe.FromIpe, Ipe |
| readCoordinate | Ipe.PathParser |
| readIpeFile | Ipe.Reader, Ipe |
| readIpeStylesheet | Ipe.Reader, Ipe |
| readMatrix | Ipe.PathParser |
| readPathOperations | Ipe.PathParser |
| readPoint | Ipe.PathParser |
| readRawIpeFile | Ipe.Reader, Ipe |
| readRectangle | Ipe.PathParser |
| readSinglePageFile | Ipe.Reader, Ipe |
| readSinglePageFileThrow | Ipe.Reader, Ipe |
| readXML | Ipe.Reader |
| RealNumber | |
| 1 (Type/Class) | HGeometry.Number.Real.Rational |
| 2 (Data Constructor) | HGeometry.Number.Real.Rational |
| rect | Ipe.Content, Ipe.Types, Ipe |
| Rectangle | |
| 1 (Data Constructor) | HGeometry, HGeometry.Box, HGeometry.Kernel |
| 2 (Type/Class) | HGeometry, HGeometry.Box, HGeometry.Kernel |
| Rectangle_ | HGeometry, HGeometry.Box.Class, HGeometry.Box, HGeometry.Kernel |
| red | Ipe.Color |
| reflection | HGeometry.Transformation |
| reflectionH | HGeometry.Transformation |
| reflectionV | HGeometry.Transformation |
| Region | HGeometry.Plane.LowerEnvelope.Connected, HGeometry.Plane.LowerEnvelope |
| Regular | HGeometry.Polygon.Triangulation.MakeMonotone |
| renderAsSvgByteString | HGeometry.Miso.Svg, HGeometry.Svg |
| renderAsSvgText | HGeometry.Miso.Svg, HGeometry.Svg |
| renderSvgToFile | HGeometry.Miso.Svg, HGeometry.Svg |
| Report | |
| 1 (Type/Class) | HGeometry.Measured.Report |
| 2 (Data Constructor) | HGeometry.Measured.Report |
| Report1 | |
| 1 (Type/Class) | HGeometry.Measured.Report |
| 2 (Data Constructor) | HGeometry.Measured.Report |
| ReportList | |
| 1 (Type/Class) | HGeometry.Measured.Report |
| 2 (Data Constructor) | HGeometry.Measured.Report |
| resolution | Ipe.IpeRender |
| RestGeoPosition | HGeometry.GeoJSON |
| RetainIpeInfo | Ipe.IpeToIpe |
| reverse | HGeometry.Sequence.Alternating |
| RightButton | HGeometry.Miso.Event.Extra |
| rightFaceOf | HGeometry.PlaneGraph |
| rightHalfPlane | HGeometry, HGeometry.Line.PointAndVector, HGeometry.Line, HGeometry.Kernel |
| RightSide | HGeometry, HGeometry.Line.PointAndVector, HGeometry.Line, HGeometry.Kernel |
| rightSide | HGeometry, HGeometry.Box, HGeometry.Kernel |
| rightTangent | HGeometry.Polygon.Convex.Tangents |
| Rigid | Ipe.Attributes, Ipe |
| root | HGeometry.Tree.Util |
| rotateCoordSystem | HGeometry.Graphics.Camera |
| rotateTo | HGeometry.Transformation |
| rotation | HGeometry.Transformation |
| roundToConstant | HGeometry.Number.Real.Symbolic |
| row | HGeometry.Matrix.Class, HGeometry.Matrix |
| rows | HGeometry.Matrix.Class, HGeometry.Matrix |
| runLatex | Ipe.IpeToIpe |
| runO | HGeometry.Ord.Dynamic |
| runParser | Ipe.PathParser |