I

=**I**= Icosahedron-a polyheadron with 20 faces.

Improper fraction-a fraction with the numerator the same or larger than the denominator.

Inequallity-a number sentance with <, >, __<, >__.

Intersect-to meet or cross.

Intersecting-meeting or crossing one another.

Isosceles triangle-a triangle with at least 2 sides that are equall in length and measure.