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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. 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 (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. ... 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...	Perpendicular and parallel lines (Geometry)	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,...
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,...
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,...
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,...
Composition of Transformations...	Transformations and symmetry (Geometry)+	Sketchpad	Activity		[2]
This "lab" contains seven "experiments" in which students perform different geometric transformations on an object to determine whether, or under what conditions, the transformations commute. More: lessons, discussions, ratings, reviews,...
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... More: lessons, discussions, ratings, reviews,...
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. ... 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,...
Diagonals of a Rhombus	Rhombus (Geometry)	Sketchpad	Activity		[0]
A guided exploration, using Geometer's Sketchpad, of the construction and diagonals of a rhombus. More: lessons, discussions, ratings, reviews,...
Dueling Pinwheels	Reflection (Geometry)+	Sketchpad	Activity		[0]
This contains construction directions for rotations, translation, and reflection, with questions to explore and a demonstration sketch to download at an introductory Sketchpad level. More: lessons, discussions, ratings, reviews,...
Equations of Lines	Line (Geometry)+	Sketchpad	Activity		[0]
A guided exploration, using Geometer's Sketchpad, of a line on the coordinate plane, and its slope. More: lessons, discussions, ratings, reviews,...
Examining Angles in Polygons	Polygons (Geometry)	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,...
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,...
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... More: lessons, discussions, ratings, reviews,...
Exploring Geometry with The Ge...	General (Geometry)	Sketchpad	Activity	$	[0]
This book guides students as they construct and manipulate geometric figures, and discover relationships and theorems on their own. It features over 100 activities covering virtually every concept st... More: lessons, discussions, ratings, reviews,...
Exploring Quadrilaterals	Quadrilaterals (Geometry)	Sketchpad	Activity		[0]
Students explore various types of quadrilaterals, investigating their properties and figuring out how the various shapes relate to each other. The link to the activity itself is to a zip file that ... More: lessons, discussions, ratings, reviews,...
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 ... More: lessons, discussions, ratings, reviews,...
Exploring and Creating Tessell...	Tessellations (Geometry)	Sketchpad	Activity		[0]
This activity has students explore and construct several different types of tessellations. The first part of the activity uses only regular polygons to create pure and semi-pure tessellations; therefo... More: lessons, discussions, ratings, reviews,...
Exploring the Golden Rectangle	Golden ratio (Geometry)	Sketchpad	Activity		[0]
In this activity, students will construct a golden section and a golden rectangle and study their characteristics and connections with the Fibonacci series. They will import pictures from the Internet... More: lessons, discussions, ratings, reviews,...
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