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Resource Name	Topic (Course)	Technology	Type	Rating
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Centroid of a Triangle - Math...	Triangles (Geometry)	Java Applet	Tool	[0]
A web page and interactive applet demonstrating the concept of the centroid of a triangle. The applet shows a triangle where the user can drag the vertices around. The centroid and the m... More: lessons, discussions, ratings, reviews,...
Parallelogram, definition and...	Parallelogram (Geometry)	Java Applet	Tool	[0]
A web page and interactive applet showing the definition and properties of a parallelogram. The applet shows a parallelogram, any vertex of which the user can drag. The other points then ... More: lessons, discussions, ratings, reviews,...
"Picking" Your Way through Are...	Polygons (Geometry)+	TI-Nspire	Activity	[0]
In this activity, students will discover Pick’s Theorem by ﬁnding the relationship between area and the number of boundary points and interior points of a lattice polygon. More: lessons, discussions, ratings, reviews,...
3-D Object Viewer	2D pictures of 3D solids (Geometry)+	Java Applet	Tool	[1]
Applet contains orthographic projections (static) and perspective drawings (dynamic) of 8 different objects; useful for building visualization skills. Toggle between "drawing" view and "3-d model" vi... More: lessons, discussions, ratings, reviews,...
3-D Visualization Activity: St...	Regular polyhedra (Geometry)+	Java Applet	Activity	[2]
Student handouts for critical thinking activity to accompany National Library of Virtual Manipulatives' Platonic Solids and Platonic Solids: Slicing applets. (view "Tool" links below) More: lessons, discussions, ratings, reviews,...
3-D Visualization Activity: Te...	Regular polyhedra (Geometry)+	Java Applet	Lesson Plan	[0]
Teacher notes for critical thinking activity to accompany National Library of Virtual Manipulatives' Platonic Solids and Platonic Solids: Slicing applets. (view "Tool" links below) Includes differenti... More: lessons, discussions, ratings, reviews,...
30 - 60 - 90 Triangles - Math ...	Right (Geometry)+	Java Applet	Tool	[0]
An interactive applet and associated web page that demonstrate the properties of a 30-60-90 triangle. The applet shows a right triangle that can be resized by dragging any vertex. As it is drag... More: lessons, discussions, ratings, reviews,...
3:4:5 Triangles - Math Open Re...	Right (Geometry)+	Java Applet	Tool	[0]
An interactive applet and associated web page that demonstrate the properties of a 3:4:5 triangle - one of the Pythagorean triples. The applet shows a right triangle that can be resized by draggin... More: lessons, discussions, ratings, reviews,...
3d ploter	Modeling and applications (Geometry)	JavaScript	Tool	[0]
The program uses the HTML5 canvas (HTML5 canvas javascript API) and web workers. Mathematical calculations are performed using the web workers, and the results are drawn on the canvas surface. Applica... More: lessons, discussions, ratings, reviews,...
4 Standard Types of Loci	Construction and loci (Geometry)	Java Applet	Tool	[0]
This allows students to explore 4 loci problems with a JavaSketchpad sketch: from 1 fixed point, from 1 fixed line, from 2 fixed points, and from 2 fixed lines. The students can manipulate the drawin... More: lessons, discussions, ratings, reviews,...
45-45-90 Triangles - Math Open...	Right (Geometry)+	Java Applet	Tool	[0]
An interactive applet and associated web page that demonstrate the properties of a 45-45-90 isosceles right triangle. The applet shows a right triangle that can be resized by dragging any vertex. ... More: lessons, discussions, ratings, reviews,...
A "Possibly New Theorem"	Triangles (Geometry)+	Sketchpad	Activity	[0]
This guided exploration, using Geometer's Sketchpad, leads students to notice what John Conway saw in this triangle construction. More: lessons, discussions, ratings, reviews,...
A Continuation of Minimum Peri...	Bisectors (Geometry)+	Sketchpad	Activity	[0]
A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad. More: lessons, discussions, ratings, reviews,...
A Dynamic Proof	Pythagorean theorem (Geometry)	Sketchpad	Activity	[0]
Students create a sketch in which a dramatic animation shows how the sum of the areas of two squares is equal to the area of the third square. The link to the activity itself is to a zip file tha... More: lessons, discussions, ratings, reviews,...
A Dynamic Proof	Pythagorean theorem (Geometry)	Sketchpad	Tool	[0]
Students create a sketch in which a dramatic animation shows how the sum of the areas of two squares is equal to the area of the third square. The link to the tool itself is to a zip file that co... More: lessons, discussions, ratings, reviews,...
A Fractals Unit for Elementary...	Fractals (Geometry)	Computer	Activity	[1]
A teaching unit on fractals for students and teachers in grades 4 to 8, that adults are free to enjoy, designed to introduce students to fractals and the underlying mathematics. It focuses on fractals... More: lessons, discussions, ratings, reviews,...
A Geometric Proof of the Pytha...	Logic and proof (Geometry)+	PowerPoint	Tool	[0]
This PowerPoint presentation uses animation and color to show a step-by-step geometric proof of the Pythagorean Theorem. It is assumed that students are already familiar with the theorem and its mean... More: lessons, discussions, ratings, reviews,...
A Japanese Temple Problem	Circles (Geometry)+	Sketchpad	Activity	[0]
In this guided Geometer's Sketchpad exploration, students use their knowledge of tangent circles to discover a relationship between the radii of three circles which are mutually tangent to each other ... More: lessons, discussions, ratings, reviews,...
A Min/Max Problem	Triangles (Geometry)	Sketchpad	Activity	[1]
A guided exploration, using Geometer's Sketchpad, of the area of a triangle formed between two fixed rays, using a third ray with a movable end point. More: lessons, discussions, ratings, reviews,...
A Minimum Perimeter Inscribed ...	Bisectors (Geometry)+	Sketchpad	Activity	[0]
A guided exploration about triangle inscribed within triangles, and the conditions under which their perimeter is at a minimum, using Geometer's Sketchpad. More: lessons, discussions, ratings, reviews,...
A New Discovery by Harold Sten...	Triangles (Geometry)	Sketchpad	Activity	[0]
In this guided exploration, students use Geometer's Sketchpad to develop their intuition about triangles and cevians in general, and a proof by Harold Stengel in particular. More: lessons, discussions, ratings, reviews,...
A Plethora of Polyhedra	Pyramids (Geometry)+	Java Applet	Tool	[4]
This is a free JAVA applet that helps users to study spatial geometry in a dynamic and interactive way. Using it, the user can rotate, zoom out, zoom in and translate a plethora of polyhedra. Moreover... More: lessons, discussions, ratings, reviews,...
A Right Triangle with Squares	Pythagorean theorem (Geometry)	Sketchpad	Activity	[0]
Students make a square tool and use the tool to investigate the Pythagorean Theorem and its converse. The link to the activity itself is to a zip file that contains the activity in pdf format. ... More: lessons, discussions, ratings, reviews,...
A Triangle Center	Triangles (Geometry)+	Sketchpad	Activity	[0]
In this guided exploration, students use Geometer's Sketchpad to discover a characteristic of one of the special triangle centers. More: lessons, discussions, ratings, reviews,...
A+ Click: Math assessment for ...	General (Geometry)	Java Applet	Tool	[0]
A+ Click is an interactive collection of more than 500 mathematical problems based on school program for grades 1 to 12. It defines the personal level of math knowledge. You move up into the next lev... More: lessons, discussions, ratings, reviews,...
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