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sphereWorld

Math 5 - Trigonometry Links – Spring ’11

Here's a virtual manipulative for experimenting with triangles to learn about congruence.  See why the congruence tests (SSS, SAS, ASS, AAS) actually work.  It shows that if you have, for instance, 3 fixed-length sides (SSS), there is a unique triangle you can construct with these.  http://nlvm.usu.edu/en/nav/frames_asid_165_g_1_t_3.html?open=instructions

Wolfram has some basic geometry demonstrations.

Alexander Bogolomny's Cut The Knot site is full of good math stuff.
For instance, an interactive proof of Pythagoras' Theorem. And another proof.
There's plenty more geometry at Cut-The-Knot.

Whistler's Alley has some geometric constructions.

The National Library of Virtual Manipulatives has some nice geometrical items. They're polynomial multiplication visualization, for instance, is nice.

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http://www.ltcconline.net/greenl/java/index.html

Additive (Fourier) Synthesis applet

Geometry Chapter - and some answers

Euclid