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Three sets of three lines such that each line is incident with two from both other sets.

Two curves are tangent externally at a point P if they lie on opposite sides of their common tangent at P

Two curves are tangent internally at a point P if they lie on the same side of their common tangent at P

A 40-sided polygon.

A 14-sided polygon, sometimes called a tetrakaidecagon.

A transversal line is a line which intersects each of a given set of other lines. It is also called a semisecant.

A 13-sided polygon, sometimes also called the triskaidecagon.

A rotation combined with an expansion or geometric contraction.

A ball of radius 1.

A function f(x) has a vertical tangent line at x_0 if f is continuous at x_0 and lim_(x->x_0)f^'(x)=+/-infty.