Pantograph
A Linkage invented in 1630 by Christoph Scheiner for making a scaled copy of a given figure. The linkage is pivoted at
; hinges are denoted 
. By placing a Pencil at 
(or 
), a Dilated image is obtainedat (or ).
- Range (Image)
- Range (Line Segment)
- Range (Statistics)
- Rank
- Rank (Group)
- Rank (Quadratic Form)
- Rank (Sequence)
- Rank (Statistics)
- Rank (Tensor)
- Ranunculoid
- RAT-Free Set
- Ratio
- Ratio Distribution
- Rational Approximation
- Rational Canonical Form
- Rational Cuboid
- Rational Distances
- Rational Domain
- Rational Double Point
- Rational Function
- Rational Integer
- Rational Number
- Rational Point
- Rational Quadrilateral
- Rational Triangle