Perpendicular Bisector
The perpendicular bisectors of a Triangle 
are lines passing through the Midpoint 
of eachside which are Perpendicular to the given side. A Triangle's three perpendicular bisectors meet ata point 
known as the Circumcenter (which is also the center of the Triangle's Circumcircle).
- Fixed Point Theorem
- Fixed Point (Transformation)
- Flag
- Flag Manifold
- Flat
- Flat Norm
- Flat Space Theorem
- Flat Surface
- Flattening
- Flemish Knot
- Fletcher Point
- Flexagon
- Flexatube
- Flexible Polyhedron
- Flip Bifurcation
- Floor Function
- Floquet Analysis
- Floquet's Theorem
- Flow
- Flower
- Flower of Life
- Flow Line
- Flowsnake
- Flowsnake Fractal
- Floyd's Algorithm