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

Fourier Series -- from Wolfram MathWorld Differential equations, Cymatics, Spherical harmonics

Line-Line Angle -- from Wolfram MathWorld

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

Line -- from Wolfram MathWorld

The Wolfram MathWorld List of Unsolved Problems

Wolfram MathWorld – edshelf

Euler Polynomial -- from Wolfram MathWorld Polynomials, Leonhard euler, Generating function

Unit-Distance Graph -- from Wolfram MathWorld

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