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Resource Name 
Topic (Course) 
Technology 
Type 
$? 
Rating 

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...
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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 ...
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"Picking" Your Way through Are...

Polygons (Geometry)+ 
TINspire 
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.
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#NoticeWonder Love

General (Geometry) 
Computer 
Story 

[0]

Annie tells the story of using Game About Squares to help students develop and strengthen their mathematical habits of mind. After they had played the game for a while, she had them reflect on the str...
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3D 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 "3d model" vi...
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3D 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)
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3D 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...
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30  60  90 Triangles  Math ...

Right (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the properties of a 306090 triangle.
The applet shows a right triangle that can be resized by dragging any vertex.
As it is drag...
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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...
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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...
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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...
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454590 Triangles  Math Open...

Right (Geometry)+ 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the properties of a 454590 isosceles right triangle.
The applet shows a right triangle that can be resized by dragging any vertex. ...
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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.
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A Continuation of Minimum Peri...

Bisectors (Geometry)+ 
Sketchpad 
Activity 

[0]

A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad.
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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...
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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...
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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...
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A Geometric Proof of the Pytha...

Logic and proof (Geometry)+ 
PowerPoint 
Tool 

[0]

This PowerPoint presentation uses animation and color to show a stepbystep geometric proof of the Pythagorean Theorem. It is assumed that students are already familiar with the theorem and its mean...
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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 ...
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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.
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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.
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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.
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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...
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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. ...
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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.
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