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Topic (Course) 
Technology 
Type 
$? 
Rating 

Set Puzzles

Addition (Math 3)+ 
Sketchpad 
Tool 

[1]

Students use logical reasoning skills to determine what numbers go inside three different colored circles to create given sums. Students are informally introduced to the concept of sets.
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Mystery Sums 1

Addition (Math 4)+ 
Sketchpad 
Tool 

[1]

Students use logic and early algebra reasoning skills to find the secret numerical values of four letters.
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Circles and Squares

Algebra (Math 3)+ 
Sketchpad 
Tool 

[0]

Using arithmetic reasoning and logic, players try to determine the secret values of the square and circle in as few turns as possible.
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Balance

Algebra (Math 4)+ 
Sketchpad 
Tool 

[0]

This sketch contains a collection of five different shapes: a star, square, circle, triangle, and diamond. The weight of these shapes can be compared by using the provided balance scale; simply drag o...
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Law of Sines Ambiguous Case

Ambiguous Case (Trigonometry) 
Sketchpad 
Activity 

[1]

Use a Geometer's Sketchpad file to investigate the ambiguous case of the law of sines.
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Law of Sines Ambiguous Case

Ambiguous Case (Trigonometry) 
Sketchpad 
Tool 

[1]

Use a Geometer's Sketchpad file to investigate the ambiguous case of the law of sines.
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Examining Angles in Circles

Angles (Geometry)+ 
Sketchpad 
Tool 

[0]

Investigate central angles, inscribed angles, angles formed by a tangent and chord, angles formed by intersecting chords, angels formed by two secants, angles formed by a tangent and a secant, and ang...
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Examining Angles in Polygons

Angles of polygons (Math 7)+ 
Sketchpad 
Activity 

[0]

Help students to discover or reinforce the angle formulas associated with polygons. Includes an activity in PDF format and a prepared sketch.
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Examining Angles in Polygons

Angles of polygons (Math 7)+ 
Sketchpad 
Tool 

[0]

Help students to discover or reinforce the angle formulas associated with polygons. Includes an activity in PDF format and a prepared sketch.
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Instantaneous Rate of Change

As an instant. rate of change (Calculus) 
Sketchpad 
Tool 

[1]

Download this Sketchpad file to investigate instantaneous rate using a model of a door operated by a door closer. Students explore the graph of the door's angle as a function of time, and find the lim...
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A Continuation of Minimum Peri...

Bisectors (Geometry)+ 
Sketchpad 
Activity 

[0]

A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad.
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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.
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Angle Bisectors in a Triangle

Bisectors (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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Simple Properties of Angle Bis...

Bisectors (Geometry)+ 
Sketchpad 
Activity 

[0]

A guided exploration using Geometer's Sketchpad of some properties of angle bisectors in a triangle.
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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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Medians in a Triangle

Centers of triangles (Geometry) 
Sketchpad 
Activity 

[0]

Students discover various properties of the three medians of a triangle. The link to the activity itself is to a zip file that contains a pdf file of the activity.
This is a free sample a...
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Two Minimum Length Problems an...

Centers of triangles (Geometry)+ 
Sketchpad 
Activity 

[0]

A guided exploration of minimum distances from vertices of a triangle or quadrilateral to a point within the figure, using Geometer's Sketchpad.
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Chords in a Circle

Chords (Geometry) 
Sketchpad 
Activity 

[0]

Students construct chords in a circle and manipulate them to discover various properties. The link to the activity itself is to a zip file that contains a pdf file of the activity.
This i...
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Examining Segments in Circles

Chords (Geometry)+ 
Sketchpad 
Tool 

[0]

Investigate the segment relationships in circles relating to chords, secants and tangents.
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Conic_Connections

Circles (Algebra II)+ 
Sketchpad 
Tool 

[1]

The user manipulates a plane and doublenapped cone to generate graphs and equations of conic sections. Eccentricity, foci, and directrices are also illustrated in both 2 and 3D.
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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 ...
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Area of a Circle

Circles (Geometry) 
Sketchpad 
Tool 

[1]

This is a downloadable Geometer's Sketchpad file that illustrates the source of the area formula for a circle.
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Areas of Regular Polygons and ...

Circles (Geometry)+ 
Sketchpad 
Tool 

[1]

Students manipulate the number of sides in a regular polygon, develop a formula relating the area and perimeter of the polygon, and use their result to develop a formula relating the circumference ...
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CenterRadius Form

Circles (Geometry) 
Sketchpad 
Tool 

[0]

This is a downloadable Geometer's Sketchpad file that illustrates the source of the centerradius area of a circle formula. Scroll halfway down this page in order to find the link to download this fil...
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