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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. More: lessons, discussions, ratings, reviews,...
A Continuation of Minimum Peri...	Bisectors (Geometry)+	Sketchpad	Activity	[0]
A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad. More: lessons, discussions, ratings, reviews,...
A Dynamic Proof	Pythagorean theorem (Math 7)+	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... More: lessons, discussions, ratings, reviews,...
A Dynamic Proof	Pythagorean theorem (Math 7)+	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 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 ... More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
A Right Triangle with Squares	Pythagorean theorem (Math 7)+	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. ... More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
Angles Formed by Parallel Line...	Intersecting, \|\|, & perp. (Math 6)+	Sketchpad	Activity	[0]
Students identify and measure corresponding angles, alternate interior angles, and alternate exterior angles, and determine which angles are congruent to each other. The link to the activity itself... More: lessons, discussions, ratings, reviews,...
Angles Formed by Parallel Line...	Intersecting, \|\|, & perp. (Math 6)+	Sketchpad	Tool	[1]
Students identify and measure corresponding angles, alternate interior angles, and alternate exterior angles, and determine which angles are congruent to each other. The link to the tool itself is ... More: lessons, discussions, ratings, reviews,...
Annie's Sketchpad activities	Modeling and applications (Geometry)	Sketchpad	Lesson Plan	[0]
Here are some activities to help you learn more about using the different aspects of Geometer's Sketchpad. The examples include using action buttons and constructing script tools. More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
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 ... More: lessons, discussions, ratings, reviews,...
Areas of Regular Polygons and ...	Pi (Geometry)+	Sketchpad	Activity	[0]
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 ... More: lessons, discussions, ratings, reviews,...
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... More: lessons, discussions, ratings, reviews,...
Box Volume	Local min / max (Algebra II)+	Sketchpad	Tool	[0]
Make an open-top box from a sheet of paper by cutting squares out of the corners. See how the volume of the box changes as the sides of the squares change. The link to the tool itself downloads the ... More: lessons, discussions, ratings, reviews,...
Cartesian Graphs and Polar Gra...	Polar Coordinates (Trigonometry)+	Sketchpad	Activity	[0]
Students compare rectangular graphs and polar graphs for functions of the form y = a sin(bx) and r = a sin(b?). Students analyze how the period and amplitude of a Cartesian graph correlate to featu... More: lessons, discussions, ratings, reviews,...
Cartesian Graphs and Polar Gra...	Polar Coordinates (Trigonometry)+	Sketchpad	Tool	[1]
Students compare rectangular graphs and polar graphs for functions of the form y = a sin(bx) and r = a sin(b?). Students analyze how the period and amplitude of a Cartesian graph correlate to featu... More: lessons, discussions, ratings, reviews,...
Center-Radius Form	Circles (Geometry)	Sketchpad	Tool	[0]
This is a downloadable Geometer's Sketchpad file that illustrates the source of the center-radius area of a circle formula. Scroll halfway down this page in order to find the link to download this fil... More: lessons, discussions, ratings, reviews,...
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... More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
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