Elliptic Cylinder
A Cylinder with Elliptical Cross-Section. The parametric equations for an elliptic cylinderof height 
, Semimajor Axis 
, and Semiminor Axis 
are
where
and 
.See also Cone, Cylinder, Elliptic Cone, Elliptic Paraboloid- Rigby Points
- Right Angle
- Right Conoid
- Right Hyperbola
- Right Line
- Right Strophoid
- Right Strophoid Inverse Curve
- Right Triangle
- Rigid
- Rigidity Theorem
- Rigid Motion
- Ring
- Ring Cyclide
- Ring Function
- Ringoid
- Ring Torus
- Risch Algorithm
- Rising Factorial
- Rivest-Shamir-Adleman Number
- RMS
- r(n)
- Robbin Constant
- Robbins Algebra
- Robbins Equation
- Robbin's Inequality