Triaugmented Triangular Prism
 |
One of the convex Deltahedra and Johnson Solid 
. The Vertices are 
, 
, 
, 
, where the
and 
coordinates of the last are found by solving
 |  |  | |
 | |  |
See also Deltahedron, Johnson Solid
- Rotation Matrix
- Rotation Number
- Rotation Operator
- Roth's Removal Rule
- Roth's Theorem
- Rotkiewicz Theorem
- Rotoinversion
- Rotor
- Rotunda
- Rouché's Theorem
- Roulette
- Round
- Rounding
- Routh-Hurwitz Theorem
- Routh's Theorem
- RSA Encryption
- RSA Number
- Rubber-Sheet Geometry
- Rubik's Clock
- Rubik's Cube
- Rudin-Shapiro Sequence
- Rudvalis Group
- Rule
- Ruled Surface
- Rule of 72