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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,...
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	[2]
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,...
Adjacent Angles - Math Open Re...	Angles (Geometry)	Java Applet	Tool	[0]
An interactive applet and associated web page that show the concept of adjacent angles (two angles that share a common leg). The applet shows three line segments with a common endpoint. The us... More: lessons, discussions, ratings, reviews,...
Adjacent Arcs - Math Open Refe...	Arcs (Geometry)	Java Applet	Tool	[0]
An interactive applet and associated web page that demonstrate the concept of adjacent arcs. The user can 3 drag points around a circle that define the endpoints of two adjacent arcs. Web page ha... More: lessons, discussions, ratings, reviews,...
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