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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. 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,...
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. More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
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... More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
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. More: lessons, discussions, ratings, reviews,...
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... 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 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,...
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,...
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. More: lessons, discussions, ratings, reviews,...
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 real-world problems by constructing the incenter and circumcenter of triangles. St... More: lessons, discussions, ratings, reviews,...
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 real-world problem by constructing the centroid of a triangle. Students will explore... More: lessons, discussions, ratings, reviews,...
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... More: lessons, discussions, ratings, reviews,...
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. 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,...
Examining Segments in Circles	Chords (Geometry)+	Sketchpad	Tool	[0]
Investigate the segment relationships in circles relating to chords, secants and tangents. 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,...
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,...
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,...
Determining the Uniqueness of ...	Circles (Geometry)	Sketchpad	Activity	[0]
Are there a certain number of arbitrary points such that there exists a unique circle through them? To explore and conjecture an answer to this question, students will construct circles passing throug... More: lessons, discussions, ratings, reviews,...
Kissing Circles	Circles (Geometry)+	Sketchpad	Activity	[0]
This guided exploration, using Geometer's Sketchpad, examines the properties of tangent circles ("osculating" or kissing circles). More: lessons, discussions, ratings, reviews,...
Paper Cup Mathematics	Circles (Geometry)+	Sketchpad	Lesson Plan	[0]
Imagine a discarded paper cup rolling on its side of a flat surface. What geometric shape does the path of the cup form? Students investigate this question and begin the activity by experimenting wit... More: lessons, discussions, ratings, reviews,...
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