Browsing: All Content in Geometry for Triangles Browse discussions |
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Resource Name |
Topic (Course) |
Technology |
Type |
$? |
Rating |
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Angles of a Triangle
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Triangles (Geometry) |
Cabri Jr. |
Activity |
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[0]
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Students measure the interior and exterior angles of a triangle and find their relationships.
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Interior Angle Theorem
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Triangles (Geometry) |
Cabri Jr. |
Activity |
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[0]
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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°.
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Euler line - Math Open Referen...
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Centers of triangles (Geometry) |
Computer |
Tool |
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[0]
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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...
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Fixed Area of a Triangle
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Triangles (Geometry) |
Computer |
Lesson Plan |
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[0]
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This lesson gives directions for teaching the fixed area of a triangle given a fixed base and height using Geometer's Sketchpad.
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Geometria
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Triangles (Geometry)+ |
Computer |
Tool |
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[0]
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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...
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Impossible Triangles
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Triangles (Geometry) |
Computer |
Activity |
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[1]
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Figure out what makes each of the given triangles impossible. Which triangle property is violated?
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Isosceles Triangle Puzzler
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Isosceles (Geometry) |
Computer |
Activity |
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[1]
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Test your knowledge on isosceles triangles by answering these questions. Then submit your answers and see what you know.
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Medians of a Triangle
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Centers of triangles (Geometry) |
Computer |
Support Material |
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[0]
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The definition and an illustration of the medians of a triangle. From Illuminations' IGD: Interactive Geometry Dictionary.
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The Centroid of a Triangle
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Centers of triangles (Geometry) |
Computer |
Lesson Plan |
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[0]
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This lesson provides directions for teaching about the centroid of a triangle using Geometer's Sketchpad.
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The Triangle Inequality
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Triangles (Geometry) |
Computer |
Lesson Plan |
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[0]
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This lesson provides directions for teaching about triangle inequality using Geometer's Sketchpad.
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Triangle Inequality in Animati...
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Triangles (Geometry) |
Computer |
Lesson Plan |
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[0]
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This lesson shows you how to create an animation of the triangle inequality using Geometer's Sketchpad.
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Random Triangles for Discoveri...
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Triangles (Geometry) |
Fathom |
Tool |
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[0]
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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...
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Area and perimeter of a triang...
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Triangles (Geometry) |
Flash |
Tool |
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[0]
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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...
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Geometric Shapes: Area of a Tr...
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Triangles (Geometry) |
Flash |
Tool |
$ |
[1]
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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...
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Law of Cosines - Math Open Ref...
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Law of cosines (Geometry) |
Flash |
Tool |
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[0]
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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...
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Law of Sines - Math Open Refer...
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Law of sines (Geometry) |
Flash |
Tool |
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[0]
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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...
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Traingle area, box method (Coo...
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Triangles (Geometry) |
Flash |
Activity |
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[0]
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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...
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Triangle area, formula (Coordi...
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Triangles (Geometry) |
Flash |
Activity |
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[0]
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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...
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Why AAA does not prove congrue...
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Triangles (Geometry) |
Flash |
Activity |
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[0]
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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...
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Why SSA does NOT prove congrue...
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Triangles (Geometry) |
Flash |
Activity |
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[0]
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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...
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Centroid of a Triangle - Math...
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Triangles (Geometry) |
Java Applet |
Tool |
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[0]
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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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30 - 60 - 90 Triangles - Math ...
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Right (Geometry) |
Java Applet |
Tool |
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[0]
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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...
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3:4:5 Triangles - Math Open Re...
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Right (Geometry) |
Java Applet |
Tool |
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[0]
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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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45-45-90 Triangles - Math Open...
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Right (Geometry) |
Java Applet |
Tool |
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[0]
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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. ...
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Angles of a Triangle
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Triangles (Geometry) |
Java Applet |
Tool |
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[0]
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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...
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