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

Wolfram Math World: Rational Number Activity for 9th - 10th Grade

WolframAlpha Resources for Educators

Line -- from Wolfram MathWorld

TangentLine Wolfram Function Repository

Line -- from Wolfram MathWorld

Line -- from Wolfram MathWorld

Unit-Distance Graph -- from Wolfram MathWorld

Wolfram MathWorld – edshelf

Sphere Line Picking -- from Wolfram MathWorld

Spacetime and Geometry: Wolfram Mathworld great circle equation error

Wolfram MathWorld – edshelf