Vertex Figure
The line joining the Midpoints of adjacent sides in a Polygon is called the polygon'svertex figure. For a regular 
-gon with side length 
,
For a Polyhedron, the faces that join at a Vertex form a solid angle whose section bythe plane is the vertex figure.See also Truncation
- k-ary Divisor
- Katona's Problem
- Kauffman Polynomial F
- Kauffman Polynomial X
- k-Chain
- k-Circuit
- k-Coloring
- Kei
- Keith Number
- Keller's Conjecture
- Kelvin Functions
- Kelvin's Conjecture
- Kelvin Transformation
- Kempe Linkage
- Kepler Conjecture
- Kepler-Poinsot Solid
- Kepler Problem
- Kepler's Equation
- Kepler's Folium
- Kepler Solid
- Ker
- Keratoid Cusp
- Kernel (Integral)
- Kernel (Linear Algebra)
- Kernel Polynomial