Line -- from Wolfram MathWorld

A line is a straight one-dimensional figure having no thickness and extending infinitely in both directions. A line is sometimes called a straight line or, more archaically, a right line (Casey 1893), to emphasize that it has no "wiggles" anywhere along its length. While lines are intrinsically one-dimensional objects, they may be embedded in higher dimensional spaces. Harary (1994) called an edge of a graph a "line." A line is uniquely determined by two points, and the

Line-Line Distance -- from Wolfram MathWorld

Least Squares Fitting - From Wolfram MathWorld, PDF, Least Squares

Wolfram Math World: Math World: Geometric Construction Handout for 9th - 10th Grade

Sphere Line Picking -- from Wolfram MathWorld

Sphere Line Picking -- from Wolfram MathWorld

Parallelian -- from Wolfram MathWorld

Wolfram Math World: Law of Sines Handout for 9th - 10th Grade

Line Integrals with Pearson and Mathematica

Line -- from Wolfram MathWorld

Schematic plot of banana trees (adapted from Wolfram MathWorld).

Example: Line graph (