List of Abstract Nouns: r

1. radius An abstract concept of a one dimension geometric feature that is the straight line radiated from the center to every point on the boundary.last updated 4/16/2015
   http://en.wikipedia.org/wiki/Radius last updated 4/16/2015
2. reality
3. rectangle An abstract concept of a two dimensional geometric figure that is a plane shape with four straight sides of opposite sides equal in length forming four internal right angles to each other.last updated 4/16/2015
   http://en.wikipedia.org/wiki/Rectangle last updated 4/16/2015
4. reward
5. right angle An abstract concept of a geometric feature that is the angle formed by two lines standing upon one another in a plane when all formed adjacent angles equal to one another and is equal to 90 degree.last updated 4/16/2015
   http://en.wikipedia.org/wiki/Right_angle last updated 4/16/2015
6. right triangle An abstract concept of a two dimensional geometric figure that is a plane shape with three straight sides of two adjacent sides forming a right angle to each other.last updated 4/16/2015
   http://en.wikipedia.org/wiki/Right_triangle last updated 4/16/2015
7. route