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A informational, non-interactive website on planimeters. Has nice graphical explanation of how linear and polar planimeters work.
Displays regions of integration in the plane for both rectangular and polar coordinates.
Works out solution of a simple flux integral problem, together with commentary
Euler was the first person to recognize that mixed second partial derivatives are equal (in general) -- except that he discussed differentials instead.
This page introduces students to the notion of particle motion and tangent (or velocity) vectors using text and accompanying animations.
Computes line integral along user-defined path in any of seven pre-defined vector fields.
Allows users to display both contour plots and surface plots of functions \(z=f(x,y)\).

Activity designed to teach: Understanding different ways of expressing area using integration. Concrete example of Area Corollary to Green's/Stokes' Theorem.

A free OS X application for exploring parametrized surfaces.It features draggable tangent lines and tangent planes; geodesics at any point, in any direction; solid or wireframe rendering; draggabl