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Resource Name 
Topic (Course) 
Technology 
Type 
$? 
Rating 

Angles of a Triangle

Triangles (Geometry) 
Cabri Jr. 
Activity 

[0]

Students measure the interior and exterior angles of a triangle and find their relationships.
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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°.
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Impossible Triangles

Triangles (Geometry) 
Computer 
Activity 

[1]

Figure out what makes each of the given triangles impossible. Which triangle property is violated?
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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.
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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...
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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...
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Why AAA does not prove congrue...

Triangles (Geometry) 
Flash 
Activity 

[1]

An interactive applet and associated web page that shows that angleangleangle (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...

Triangles (Geometry) 
Flash 
Activity 

[1]

An interactive applet and associated web page that shows that sidesideangle is not enough
to prove congruence, because two triangles can meet the condition.
The applet shows two triangles, on...
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Right Triangle Geometry

Right (Geometry) 
Java Applet 
Activity 

[2]

This eModule presents realworld problems that motivate students to work with right triangle geometry. Interactive worksheets and diagrams with feedback help students learn to solve for unknown angles...
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Triangle Geometry

Obtuse (Geometry)+ 
Java Applet 
Activity 

[1]

This eModule presents realworld problems that motivate students to work with triangle geometry. Interactive worksheets and diagrams with feedback help students learn to solve for unknown angles and s...
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Types of Triangles

Isosceles (Geometry)+ 
Java Applet 
Activity 

[1]

This activity is available in Word, PDF, or HTML format and at two different levels (an introduction to types of triangles, and a more advanced version). Students use a GSP sketch or interactive web ...
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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...

Triangles (Geometry)+ 
Sketchpad 
Activity 

[0]

A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad.
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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 ...

Triangles (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 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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Angle Bisectors in a Triangle

Triangles (Geometry)+ 
Sketchpad 
Activity 

[0]

A guided exploration of the angle bisectors of a triangle, and the point at which they intersect, using Geometer's Sketchpad.
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Circumscribed Triangles

Triangles (Geometry) 
Sketchpad 
Activity 

[0]

A guided exploration of the relationship between the midpoints of a triangle inscribed in a circle, and the center of the circle, using Geometer's Sketchpad.
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Constellations

Triangles (Geometry) 
Sketchpad 
Activity 

[0]

The task requires students to classify triangles according to angle and side properties. Students use Geometer's Sketchpad to manipulate triangles to see that constructed triangles have imposed...
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Constructions of Equilateral a...

Isosceles (Geometry)+ 
Sketchpad 
Activity 

[0]

Students will discuss the difference between drawing and constructing a triangle using The Geometer’s Sketchpad. They will further develop constructions for both isosceles and equilateral triangles. ...
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Exploring Centers of a Triangl...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

Using problem solving skills, formal geometry, and The Geometer's Sketchpad, students will model and solve two realworld problems by constructing the incenter and circumcenter of triangles. St...
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Exploring Centers of a Triangl...

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

Using problem solving skills, formal geometry, and The Geometer's Sketchpad, students will model and solve a realworld problem by constructing the centroid of a triangle. Students will explore...
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Exploring Characteristics of T...

Triangles (Geometry) 
Sketchpad 
Activity 

[0]

Students draw triangles and explore the classification of each using the measures of interior angles and lengths of sides. In the extension activities, the students further explore and generalize a fo...
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Exploring Types of Triangles

Triangles (Geometry) 
Sketchpad 
Activity 

[0]

Students explore various triangle properties, such as scalene, isosceles, equilateral, acute, right, and obtuse. The link to the tool itself is to a zip file that contains both the activity in pdf ...
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