Parallel Projection

Parallelepiped

Parallelogram

Parameter

Partial Variation Function

Pencil of Circles

Pencil of Lines

Pencil of Parallel Lines

Pentadecagon

Pentagon

Pentahedron

Pentomino

Perimeter

Periodic Tessellation

Perpendicular

Perpendicular Bisector

Perpendicular Line Segments

Perpendicular Lines

Perpendicular Planes

Perpendicular Vectors

Perspective

Physical Space

Pi

Pick’s Theorem

Pierre Herigone (1580-1644)

Plane

Plane Geometric Figure

Plane of Symmetry

Plane Quadrilateral

Plane Solid

Plane Surface

Platonic Solid

Point

Point of Division

Point of Intersection

Polar Angle

Polar Axis

Polar Coordinate System

Polar Coordinates of a Point

Polar Graph

Polycube

Polygon

Polygon Circumscribed About a Circle

Polygon Inscribed in a Circle

Polygonal Chain

Polyhedral Angle

Polyhedron

Polyhedron Circumscribed About a Sphere

Polyhedron Inscribed in a Sphere

Polyiamond

Polyomino

Postulate

Pre-Image

Prism

Prismatic Surface

Protractor

Pyramid

Pyramidal Surface

Pythagoras (c. 580 – c. 495 BCE)

Pythagorean Equation

Pythagorean Triple

Quadrant

Quadratic

Quadrilateral

Radian

Radius

Radius of a circle

Radius of a Circular Cone

Radius of a Circular Cylinder

Radius of a Sphere

Radius of a Torus

Ratio of Similarity

Rational Function

Ray

Re-Entrant Angle

Re-Entrant Angular Sector

Reciprocal

Rectangle

Reduction

Reflection

Reflection in a Cartesian Plane

Reflex Angle

Region In the Plane

Regular Convex Polyhedron

Regular Polygon

Regular Polyhedron

Regular Prism

Regular Pyramid

Regular Solid

Regular Star Polygon

Regular Star Polyhedron

Regular Tessellation

Relationship of Congruence

Relationship of Cyclical Variation

Relationship of Exponential Variation

Relationship of Inverse Variation

Relationship of Parallelism

Relationship of Partial Variation

Relationship of Perpendicularity

Relationship of Second-Degree Variation