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Rectangle
- a parallelogram with four right angles
Rectangles
- a parallelogram with four right angles
Reentrant Angle
- an interior angle of a polygon that is greater than 180 degrees
- an interior angle of a polygon that is greater than 180 degrees
Reentering Angle
- an interior angle of a polygon that is greater than 180 degrees
- an interior angle of a polygon that is greater than 180 degrees
Right Angle
- the 90 degree angle between two perpendicular lines
- a quarter of the circumference of a circle
Reflex Angle
- an angle greater than 180 degrees (but less than 360)
- an angle greater than 180 degrees (but less than 360)
Round Angle
- an angle of 360 degrees
- an angle of 360 degrees
Rhombohedron
- a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
Rhombohedrons
- a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
Regular Polyhedron
- any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
- any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent