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Resource Name 
Topic (Course) 
Technology 
Type 
$? 
Rating 

30  60  90 Triangles  Math ...

Right Triangles (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...

Special right triangle (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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454590 Triangles  Math Open...

Special right triangle (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 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...
More: lessons, discussions, ratings, reviews,...

A Geometric Proof of the Pytha...

Pythagorean theorem (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 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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Angles of Elevation and Depres...

Trigonometry (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains angles of elevation and depression, and how to use those to solve realworld problems.
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Applications of the Tangent Ra...

Trigonometry (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains how to find the tangent of an angle and how the tangent ratio is used to make indirect measurements when the measures of a leg and an acute angle of a right triangle are know...
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Circles Around Pythagoras

Right Triangles (Geometry) 
Computer 
Activity 

[2]

A problem on finding the areas created within three concentric circles.
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Distance Formula (Geometry)

Pythagorean theorem (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains how to use the Pythagorean Theorem to find the distance between two points in the plane.
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Euclid's Elements, Book I, Pro...

Pythagorean theorem (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition lays out the Pythagorean Theorem  the sum of the squares of the sides of a right triangle equal the square of the hypotenuse. The guide then examines the structure of the proposi...
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Euclid's Elements, Book I, Pro...

Pythagorean theorem (Geometry) 
Java Applet 
Tool 

[0]

Euclid's proposition states that if the square of one side equals the sum of the squares of the other two side, then the angle between the two sides which sum is a right angle. The guide then examine...
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GeoCon

Right Triangles (Geometry) 
iPhone 
Tool 
$ 
[1]

GeoCon is designed to be used by students, teachers and math enthusiasts studying plane geometry. With GeoCon various constructions can be created with the touch of a finger. Resolve construction task...
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GeoCon HD

Right Triangles (Geometry) 
iPad 
Tool 
$ 
[1]

GeoCon HD is designed to be used by students, teachers and math enthusiasts studying plane geometry. With GeoCon HD various constructions can be created with the touch of a finger. Resolve constructio...
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Geoboard

Right Triangles (Geometry) 
Java Applet 
Tool 

[0]

Use geoboard to illustrate area, perimeter, and rational number concepts.
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Geometria

Right Triangles (Geometry)+ 
Computer 
Tool 

[0]

Geometria is free (GPL) crossplatform software based on a tworole (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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Inverse Sine and Cosine (Geome...

Trigonometry (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains inverse cosine and sine and how to use them to calculate angle measures.
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Inverse Tangent (Geometry)

Trigonometry (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains the inverse tangent and core inverse functions: arcsine, arccosine and arctangent.
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Learn Trig...The Easy Way

Right Triangles (Geometry)+ 
Java Applet 
Tool 

[3]

Introduction
You know how to find the length of the third side of a right triangle when the lengths of the two other sides were given, but how does a person determine the length of a side if t...
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Leonardo da Vinci's Proof

Pythagorean theorem (Geometry) 
Sketchpad 
Activity 

[0]

Students use reflection and rotation to build a sketch that demonstrates a famous proof by Leonardo. The link to the activity itself is to a zip file that contains both the activity in pdf format ...
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Leonardo da Vinci's Proof

Pythagorean theorem (Geometry) 
Sketchpad 
Tool 

[0]

Students use reflection and rotation to build a sketch that demonstrates a famous proof by Leonardo. The link to the tool itself is to a zip file that contains both the sample sketch (designed to ...
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Panda Geometry Problem  the ...

Pythagorean theorem (Geometry) 
Shockwave 
Tool 

[0]

The 3D animated video helps students understand the wordings in a geometry problem. Although the video shows the traditional way to solve the problem, a novel way video only requires free log in. It ...
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Perpendicular Slopes

Pythagorean theorem (Geometry) 
TINspire 
Activity 

[0]

In this activity, students investigate the “negative reciprocal” relationship between the slopes of perpendicular lines. The final phase of the activity is appropriate for more advanced students as th...
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Pythagoras Plugged In: Proofs ...

Pythagorean theorem (Geometry) 
Sketchpad 
Activity 
$ 
[0]

This book guides students through a variety of proofs and applications of the Pythagorean theorem. By constructing and dynamically manipulating figures, students visualize the theorem and gain insight...
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