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Exterior Angles in a Polygon	Exterior (Geometry)+	Sketchpad	Activity		[0]
Students construct a pentagon with its exterior angles, measure the angles and find the sum. They then dilate the pentagon to look at the problem, and understand their result, in a new way. The lin... More: lessons, discussions, ratings, reviews,...
Geometry Activities for Middle...	Points and lines (Geometry)+	Sketchpad	Activity	$	[0]
These activities provide students with the opportunity to explore geometric concepts such as symmetry, transformations, and even fractal geometry in a way no other teaching tool can. The dynamic ca... More: lessons, discussions, ratings, reviews,...
Geometry Quickies #1	Triangles (Geometry)+	Sketchpad	Activity		[0]
The activity based around medians in this series may generate some questions. Here is a further exploration of the topics it raised, again with reference to Geometer's Sketchpad. More: lessons, discussions, ratings, reviews,...
Inscribed Triangles	Triangles (Geometry)+	Sketchpad	Activity		[0]
A guided exploration, using Geometer's Sketchpad, of a property of triangles inscribed in a circle. More: lessons, discussions, ratings, reviews,...
Intercepts of Lines and their ...	Line (Geometry)+	Sketchpad	Activity		[0]
A guided exploration, using Geometer's Sketchpad, of lines on the coordinate plane, and the relation of intercepts to linear equations. 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,...
Leonardo da Vinci's Proof	Pythagorean theorem (Geometry)	Sketchpad	Activity		[0]
Students use reflection and rotation to build a sketch that demonstrates a famous proof by Leonardo. The link to the activity itself is to a zip file that contains both the activity in pdf format ... 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,...
Medians in a Triangle	Triangles (Geometry)+	Sketchpad	Activity		[0]
A guided exploration of medians in a triangle using Geometer's Sketchpad. More: lessons, discussions, ratings, reviews,...
Midpoint Quadrilaterals	Quadrilaterals (Geometry)+	Sketchpad	Activity		[0]
Students construct the midpoints of the sides of a quadrilateral, connect them to form the midpoint quadrilateral, and then discover interesting properties of the midpoint quadrilateral. The link t... More: lessons, discussions, ratings, reviews,...
Proof as Discovery: Kite Midpo...	Logic and proof (Geometry)+	Sketchpad	Activity		[0]
Students investigate and prove a property of kites, and use the proof to make a discovery about other quadrilaterals. The link to the activity itself is to a zip file that contains both the activi... More: lessons, discussions, ratings, reviews,...
Proof as Explanation: Distance...	Logic and proof (Geometry)+	Sketchpad	Activity		[0]
Students explore the sum of certain distances in an equilateral triangle, and develop a proof to explain their observations. The link to the activity itself is to a zip file that contains both the... More: lessons, discussions, ratings, reviews,...
Proof as Systematization: Tria...	Logic and proof (Geometry)+	Sketchpad	Activity		[1]
Students use Sketchpad to develop a proof for a result that was discovered and used (without proof) in an earlier activity. The link to the activity itself is to a zip file that contains both the a... More: lessons, discussions, ratings, reviews,...
Proof as Verification: Areas	Logic and proof (Geometry)+	Sketchpad	Activity		[0]
Students form a conjecture about the ratio of two areas in a quadrilateral, and use Sketchpad to search for a proof. In the process they verify or disprove their results for two different kinds of ... More: lessons, discussions, ratings, reviews,...
Properties of Parallel Lines	Parallel (Geometry)+	Sketchpad	Activity		[2]
Students discover relationships among the angles formed when parallel lines are intersected by a transversal. The link to the activity itself is to a zip file that contains a pdf file of the activi... More: lessons, discussions, ratings, reviews,...
Pythagoras Plugged In: Proofs ...	Pythagorean theorem (Geometry)	Sketchpad	Activity	$	[0]
This book guides students through a variety of proofs and applications of the Pythagorean theorem. By constructing and dynamically manipulating figures, students visualize the theorem and gain insight... More: lessons, discussions, ratings, reviews,...
Quadrilateral Exploration: Sha...	Quadrilaterals (Geometry)	Sketchpad	Activity		[0]
Students first use the seven "Quadrilateral Makers" (square maker, rhombus maker, rectangle maker, parallelogram maker, kite maker, trapezoid maker, and quadrilateral maker) to make a design of their ... More: lessons, discussions, ratings, reviews,...
Quadrilaterals	Quadrilaterals (Geometry)+	Sketchpad	Activity		[0]
Investigate the parallelogram, rectangle, square, rhombus, and isosceles trapezoid. Includes an activity in PDF format and a prepared sketch. More: lessons, discussions, ratings, reviews,...
Reflection and Rotation Symmet...	Reflection (Geometry)+	Sketchpad	Activity		[2]
Students test a variety of figures for symmetry by actually constructing reflections and rotations. The link to the tool itself is to a zip file that contains both the activity in pdf format and t... More: lessons, discussions, ratings, reviews,...
Reflections over Two Intersect...	Reflection (Geometry)	Sketchpad	Activity		[0]
Students explore what happens when they reflect a figure over a line and then reflect the image over a second line that intersects the first. The link to the activity itself is to a zip file that c... More: lessons, discussions, ratings, reviews,...
Rethinking Proof with The Geom...	General (Geometry)	Sketchpad	Activity	$	[0]
This book harnesses the power of Dynamic Geometry� to engage students in proving conjectures and thinking about proof in different ways. Rethinking Proof offers other motivations for pro... More: lessons, discussions, ratings, reviews,...
Shape Makers: Developing Geome...	Triangles (Geometry)+	Sketchpad	Activity	$	[0]
Author Michael Battista has built what he calls the Shape Makers computer microworld, a series of explorations in which students develop dynamic mental models for thinking about geometric shapes an... 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,...
Standard Equation of a Line	Line (Geometry)+	Sketchpad	Activity		[0]
A guided exploration, using Geometer's Sketchpad, of the standard form of a linear equation. More: lessons, discussions, ratings, reviews,...
The Centroid of a Triangle	Triangles (Geometry)+	Sketchpad	Activity		[0]
An exploration using Geometer's Sketchpad of the centroid of a triangle, and the way it divides the larger triangle. More: lessons, discussions, ratings, reviews,...
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