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Angles of a Triangle	Triangles (Geometry)	Cabri Jr.	Activity		[0]
Students measure the interior and exterior angles of a triangle and find their relationships. More: lessons, discussions, ratings, reviews,...
Interior Angle Theorem	Triangles (Geometry)	Cabri Jr.	Activity		[0]
This activity is designed to help students discover the Interior Angle Theorem: The sum of the measures of the interior angles of a triangle is 180°. More: lessons, discussions, ratings, reviews,...
Euler line - Math Open Referen...	Centers of triangles (Geometry)	Computer	Tool		[0]
An interactive applet and associated web page that describe the Euler line. It shows a triangle whose vertices can be dragged. As you drag them, the centroid, circumcenter and orthocenter mov... More: lessons, discussions, ratings, reviews,...
Fixed Area of a Triangle	Triangles (Geometry)	Computer	Lesson Plan		[0]
This lesson gives directions for teaching the fixed area of a triangle given a fixed base and height using Geometer's Sketchpad. More: lessons, discussions, ratings, reviews,...
Geometria	Triangles (Geometry)+	Computer	Tool		[0]
Geometria is free (GPL) cross-platform software based on a two-role (teacher, student) model. The teacher creates a problem, provides it with an answer and saves the problem in a file. The student ope... More: lessons, discussions, ratings, reviews,...
Impossible Triangles	Triangles (Geometry)	Computer	Activity		[1]
Figure out what makes each of the given triangles impossible. Which triangle property is violated? More: lessons, discussions, ratings, reviews,...
Isosceles Triangle Puzzler	Isosceles (Geometry)	Computer	Activity		[1]
Test your knowledge on isosceles triangles by answering these questions. Then submit your answers and see what you know. More: lessons, discussions, ratings, reviews,...
Medians of a Triangle	Centers of triangles (Geometry)	Computer	Support Material		[0]
The definition and an illustration of the medians of a triangle. From Illuminations' IGD: Interactive Geometry Dictionary. More: lessons, discussions, ratings, reviews,...
The Centroid of a Triangle	Centers of triangles (Geometry)	Computer	Lesson Plan		[0]
This lesson provides directions for teaching about the centroid of a triangle using Geometer's Sketchpad. More: lessons, discussions, ratings, reviews,...
The Triangle Inequality	Triangles (Geometry)	Computer	Lesson Plan		[0]
This lesson provides directions for teaching about triangle inequality using Geometer's Sketchpad. More: lessons, discussions, ratings, reviews,...
Triangle Inequality in Animati...	Triangles (Geometry)	Computer	Lesson Plan		[0]
This lesson shows you how to create an animation of the triangle inequality using Geometer's Sketchpad. More: lessons, discussions, ratings, reviews,...
Random Triangles for Discoveri...	Triangles (Geometry)	Fathom	Tool		[0]
Paul Myers created this demonstration as he was designing a Fathom project for Discovering Geometry. It shows when a triangle can be formed from the pieces after two random cuts are made in a 2... More: lessons, discussions, ratings, reviews,...
Area and perimeter of a triang...	Triangles (Geometry)	Flash	Tool		[0]
An interactive applet and associated web page that show the relationship between the perimeter and area of a triangle. It shows that a triangle with a constant perimeter does NOT have a constant... More: lessons, discussions, ratings, reviews,...
Geometric Shapes: Area of a Tr...	Triangles (Geometry)	Flash	Tool	$	[1]
Flash-based introduction to finding the area of a triangle, given the base and height. College Cram charges access fees by the month or by the semester for most resources. To get a preview of thei... More: lessons, discussions, ratings, reviews,...
Law of Cosines - Math Open Ref...	Law of cosines (Geometry)	Flash	Tool		[0]
A web page and interactive applet demonstrating the Law of Cosines. The applet shows a triangle with draggable vertices. As you drag them, the Law of Cosines formula is continually r... More: lessons, discussions, ratings, reviews,...
Law of Sines - Math Open Refer...	Law of sines (Geometry)	Flash	Tool		[0]
A web page and interactive applet demonstrating the Law of Sines. The applet shows a triangle with draggable vertices. As you drag them, the "Law of Sines" ratio is continually recal... More: lessons, discussions, ratings, reviews,...
Traingle area, box method (Coo...	Triangles (Geometry)	Flash	Activity		[0]
An interactive applet and associated web page that calculate the area of a triangle using the box method in coordinate geometry. The applet has a triangle with draggable vertices. As you drag t... More: lessons, discussions, ratings, reviews,...
Triangle area, formula (Coordi...	Triangles (Geometry)	Flash	Activity		[0]
An interactive applet and associated web page that calculate the area of a triangle using the formula method in coordinate geometry. The applet has a triangle with draggable vertices. As you dr... More: lessons, discussions, ratings, reviews,...
Why AAA does not prove congrue...	Triangles (Geometry)	Flash	Activity		[0]
An interactive applet and associated web page that shows that angle-angle-angle (AAA) is not enough to prove congruence. The applet shows two triangles, one of which can be dragged to resize it... More: lessons, discussions, ratings, reviews,...
Why SSA does NOT prove congrue...	Triangles (Geometry)	Flash	Activity		[0]
An interactive applet and associated web page that shows that side-side-angle is not enough to prove congruence, because two triangles can meet the condition. The applet shows two triangles, on... More: lessons, discussions, ratings, reviews,...
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,...
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,...
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,...
Angles of a Triangle	Triangles (Geometry)	Java Applet	Tool		[0]
Provides an applet that demonstrates how the three angles of a triangle add to 180 degrees. Another applet at the bottom gives step-by-step instructions on how to do this activity with a piece of pap... More: lessons, discussions, ratings, reviews,...
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