Circle-Point Midpoint Theorem
Taking the locus of Midpoints from a fixed point to a circleof radius 
results in a circle ofradius 
. This follows trivially from
References
Johnson, R. A. Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle. Boston, MA: Houghton Mifflin, p. 17, 1929.
- Product Neighborhood
- Product Rule
- Product Space
- Program
- Projection
- Projection Operator
- Projective Collineation
- Projective General Linear Group
- Projective General Orthogonal Group
- Projective General Unitary Group
- Projective Geometry
- Projective Plane
- Projective Plane PK2
- Projective Space
- Projective Special Linear Group
- Projective Special Orthogonal Group
- Projective Special Unitary Group
- Projective Symplectic Group
- Projectivity
- Prolate Cycloid
- Prolate Cycloid Evolute
- Prolate Spheroid
- Prolate Spheroidal Coordinates
- Prolate Spheroidal Wave Function
- Pronic Number