Illustrated Mathematics Dictionary - Letter I    

i (Unit Imaginary Number) Icosahedron Identity Imaginary Number Imperial System Improper Fraction Incenter Inch Incircle

Incircle of Triangle Included Angle Included Side Increase Independent Event Index (Power) Inequality Infinite Infinity

Inflation Inradius Inscribe Integer Interest Interest Rate Interior Angle Intersect Intersection

Interval Inverse Inverse Operation Irrational Number Irregular Polygon Isosceles Triangle