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

TangentLine Wolfram Function Repository

Concept Schools – Department of Mathematics » Wolfram MathWorld

Tangent Line -- from Wolfram MathWorld

TangentLine Wolfram Function Repository

Wolfram Math World: Half Angle Formulas Activity for 9th - 10th Grade

Wolfram MathWorld – edshelf

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

Line -- from Wolfram MathWorld

Line -- from Wolfram MathWorld

Wolfram Math World: Hyperboloid Handout for 9th - 10th Grade