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Xah: Visual Dictionary of Special Plane Curves - http://www.xahlee.org/SpecialPlaneCurves_dir/specialPlaneCurves.html
A Visual Dictionary of Special Plane Curves with graphics. |
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Pythagorean Theorem - http://www.cut-the-knot.org/pythagoras/index.shtml
A collection of 43 proofs - some interactive - of the Pythagorean theorem. |
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Occurrence of the Conics - http://britton.disted.camosun.bc.ca/jbconics.htm
Images of conics by Jill Britton. |
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Tim's Triangular Page - http://sakharov.net/triangle.html
Explains the basic properties, formulas, theorems and different types of triangles. Includes proofs and illustrations. |
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Polygons - http://www.ul.ie/~cahird/polyhedronmode/polygons.htm
Discusses the differences between the different types of these straight sided figures. Also, explains the difference between regular and irregular shapes. |