Right Angle
An Angle equal to half the Angle from one end of a line segment to the other. A right angle is 
radians or 90°. A Triangle containing a right angle is called a Right Triangle. However, aTriangle cannot contain more than one right angle, since the sum of the two right angles plus the third angle wouldexceed the 180° total possessed by a Triangle.
- Nonassociative Algebra
- Nonassociative Product
- Nonaveraging Sequence
- Noncentral Distribution
- Noncommutative Group
- Nonconformal Mapping
- Nonconstructive Proof
- Noncototient
- Noncylindrical Ruled Surface
- Nondecreasing Function
- Nondividing Set
- Nonessential Singularity
- Non-Euclidean Geometry
- Nonillion
- Nonincreasing Function
- Nonlinear Least Squares Fitting
- Nonnegative
- Nonnegative Integer
- Nonnegative Partial Sum
- Nonorientable Surface
- Nonpositive
- Nonsquarefree
- Nonstandard Analysis
- Nontotient
- Nonwandering