Geometry

GRACE - Graphical Ruler and Compass Editor: Let you draw geometrical shapes, that is lines and circles, to prove various geometrical properties.
NonEuclid: Provides a tutor and applet for learning non-Euclidian geometry. Requires Java 1.1.3 support.
Copyright Joel Castellanos
Basic Geometry applets: Eight applets demonstrating basic geometric properties.
Advanced Geometric Configurations: Nine applets demonstrating more advanced geometric properties.
Morley's Theorem: Graphical demonstration of Morley's theorem.
Finding the Slope of Line Segment: Computes the slope of a line between two graphically given points.
(Copyright Robert Bunge)
ArcLength: Approximates the arc length of a polonomial of degree three or smaller.
The Light cone: An illuminating introduction to relativity.
Cinderellas Cafe: Many geometric demonstrations.
(In German. Copyright Richter-Gebert&Kortenkamp)
Geometry Explorer: Shows many different geometric shapes, and how they appear.
Dispaly all three and four dimensional regular solids: All regular solids in 3D or 4D are shown. Rotatable.
Imaging Raytracer: Displays diffent geometrical shapes and how to change the eye view.
(Copyright by Paul Flavin.)
NINA: Draws colored figures from simple geometric shapes.
Construction: Construct an n-gon (polygon with n sides) for which n given points serve as midpoints of its sides.
(Copyright Alexander Bogomolny)

Volume and area computations

2 Dimensional Geometrical Computation: Calculates the area and perimeter of several geometrical shapes given their properties.
(Copyright Jun Ni. CGI-script.)
3 Dimensional Geometry Computation: Calculates many essential properties of geometrical 3D-shapes given their sizes.
(Copyright Jun Ni. CGI-script)
Constant Perimeter and Constant Area Rectangles: Demonstrates how to construct rectangles of constant area or perimeter.
(Education Development center)
Area of a circle: Approximates the area of a circle with an inscribed regular polygon with up to 1000 sides.
Hexagonal Area Calculator: Computes the area of a hexagon given its width or the other way around.
(Hexnet. Java Script)
Epipolar Geometry: Demonstrates the basics of epipolar geometry.
Cheng-Pleijel Point of a Quadrangle: Demonstration of the Cheng-Pleijel Point of a Quadrangle.
Angle Trisection: Demonstrates how to trisect a given angle.
(Copyright Alexander Bogomolny)

Collection: A collection of 57 demonstrations on various basic geometric subjects.
(International Education Software)
Collection: A collection of 21 demonstrations on geometric topics in calculus.
(International Education Software)
Collection: Collection of 26 demonstrations on more advanced geometrics.
(International Education Software)
Interact with Pascal's Theorem: Demonstrates the concept of Pascal's theorem.
Interact with Pascal's Theorem: Same as above, only input is given by numbers, not graphically.
(Geometry center. CGI-script)
WebPisces Models: 10 different Pisces models with various parameter inputs.
(CGI-script)
Euclid's Elements: Contains the complete text of Euclid's Elements, and including demonstarations using java applets.
(Copyright D.E.Joyce, Clark University)
Nine Point Circle: Shows how nine different points in a triangle are on the same circle, and presents three proofs of this.
Analog gadgets: Demostrates how to make an circle or ellipse by resizing a triangle.
(Copyright Alexander Bogomolny)
Circles: Demonstrates how to draw a circle.
Peaucellier Linkage: Shows how a circle movement can be transformed into a straight line movement.
(Copyright Alexander Bogomolny)
Kepler's laws: Demonstrates Kepler's laws graphically.
(Copyright UBC Mathematical Department)

Famous Curves: 56 different curves drawn with applets. Includes demonstration of graphic properties of the curves.
(JohnJ O`Connor, Edmund F Robertson :
School of Mathematical and Computational
Science University of St Andrews.)

Parabola: Demonstrates how to use the definition of a parabola to draw one.
Envelopes: Draws the envelope of a group of parabolas with the same initial velocity.
Parabolas&Circles: Demonstrates how different angled parabolas all will end on the same circle after a given time.
Point/Line Duality: Draws a line depending on a given point and circle or parabola.
(Computational Geoetry)
Tangent line for parabola: Shows how a secant line turns into a tangent line on a parabola.

Ellipse: Draws an ellipse based on its definition.
Congruent Zeta function Calculator for Hyperelliptic Curves: Computes the zeta function for an elliptic or hyperelliptic curve.
(Source avaliable. CGI-script.)

Stereoscopic animated Hypercupe: Shows an rotating hypercube in 3D. 3D-glasses may be useful.
Stereoscopic Animated 24-Cell Object: Same as above, with a 24-cell object.
(Source code avaliable.)
Stereoscopic animated Cross-Polytype: Same as above, with a cross-polytype
(Source code avaliable.)
Hyberspace simulation wiht arbitrary number of dimensions: Displays the projection and intersection of a hypercube in 3 dimensions. Includes a thorough discussion of the applet.
(weBus. Source code avaliable.)
Octahedron: Interactive animation of an tetrahedron with the central octahedron missing.
The Geometry Applet: Shows an icosahedron which can be turned and moved.
(David E. Joyce Department of Mathematics and Computer Science . Source code avaliable.)
Stereoscopic Interactive Hypercube Slicer: Demonstrates a 4-dimensional cube falling through a 3-dim. space.
( Copyright Stefan Scheller. Java Script)

Spirograph: Draws a spirograph from given input parameters; circle radii, offset and number of iterations.
(Source code avaliable.)
Spirograph: Draws a spirograph from two slowly moving circles.
(Source code avaliable.)
Cycloids: Demonstrates how to draw trachoids by spinning a wheel. Both regular cycloids, hypocycloids as well as epicycloids can be drawn.
(Copyright Alexander Bogomolny)

Curve: Demonstrates a Hermite, Bezier or B-spline curve based on four points.
(Source code avaliable.)
Curves: Shows a Bezier and/or Bspline curve based on arbitrarily many points.
(Text in japanese, applet in english.)
Groove: Draws Bezier curves.
(Source code avaliable.)
Bezier Splines: Demonstrates the drawing of a Bezier curve between two endpoints and with two additional points in between.
(Copyright UBC Mathematics department.)
Bezier Curve: Plots a Bezier curve based on arbitrarily many points.

Different groups of geometric shapes in VRML-worlds:

(Virtual Polyhedra. VRML)