Square Cutting
The average number of regions into which 
lines divide a Square is
(Santaló 1976).See also Circle Cutting
References
Finch, S. ``Favorite Mathematical Constants.'' http://www.mathsoft.com/asolve/constant/geom/geom.html Santaló, L. A. Integral Geometry and Geometric Probability. Reading, MA: Addison-Wesley, 1976.
- Interquartile Range
- Interradius
- Intersection
- Interspersion
- Intersphere
- Interval
- Interval Graph
- Interval Order
- Intrinsically Linked
- Intrinsic Curvature
- Intrinsic Equation
- Invariant
- Invariant Density
- Invariant (Elliptic Function)
- Invariant Manifold
- Invariant Point
- Invariant Subgroup
- Inverse Cosecant
- Inverse Cosine
- Inverse Cotangent
- Inverse Curve
- Inverse Filter
- Inverse Function
- Inverse Hyperbolic Cosecant
- Inverse Hyperbolic Cosine