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Resource Name |
Topic (Course) |
Technology |
Type |
$? |
Rating |
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Parallel Lines and Transversal...
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Perpendicular and parallel lines (Geometry) |
PowerPoint |
Activity |
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 [0]
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Student worksheet to accompany Parallel Lines and Transversals PowerPoint document (see resource connection below)
More: lessons, discussions, ratings, reviews,...
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A "Possibly New Theorem"
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Triangles (Geometry)+ |
Sketchpad |
Activity |
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[0]
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This guided exploration, using Geometer's Sketchpad, leads students to notice what John Conway saw in this triangle construction.
More: lessons, discussions, ratings, reviews,...
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A Continuation of Minimum Peri...
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Bisectors (Geometry)+ |
Sketchpad |
Activity |
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[0]
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A further guided exploration of triangles inscribed within triangles, using Geometer's Sketchpad.
More: lessons, discussions, ratings, reviews,...
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A Dynamic Proof
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Pythagorean theorem (Geometry) |
Sketchpad |
Activity |
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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...
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A Japanese Temple Problem
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Circles (Geometry)+ |
Sketchpad |
Activity |
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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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A Min/Max Problem
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Triangles (Geometry) |
Sketchpad |
Activity |
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 [1]
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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.
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A Minimum Perimeter Inscribed ...
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Bisectors (Geometry)+ |
Sketchpad |
Activity |
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[0]
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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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A New Discovery by Harold Sten...
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Triangles (Geometry) |
Sketchpad |
Activity |
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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.
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A Right Triangle with Squares
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Pythagorean theorem (Geometry) |
Sketchpad |
Activity |
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[0]
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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. ...
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A Triangle Center
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Triangles (Geometry)+ |
Sketchpad |
Activity |
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In this guided exploration, students use Geometer's Sketchpad to discover a characteristic of one of the special triangle centers.
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Angle Bisectors in a Triangle
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Bisectors (Geometry)+ |
Sketchpad |
Activity |
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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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Angles Formed by Parallel Line...
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Perpendicular and parallel lines (Geometry) |
Sketchpad |
Activity |
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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...
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Areas of Regular Polygons and ...
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Pi (Geometry)+ |
Sketchpad |
Activity |
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[0]
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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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Chords in a Circle
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Chords (Geometry) |
Sketchpad |
Activity |
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[0]
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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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Circumscribed Triangles
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Triangles (Geometry)+ |
Sketchpad |
Activity |
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[0]
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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.
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Composition of Transformations...
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Transformations and symmetry (Geometry)+ |
Sketchpad |
Activity |
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[2]
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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.
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Constellations
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Triangles (Geometry) |
Sketchpad |
Activity |
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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...
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Constructions of Equilateral a...
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Isosceles (Geometry)+ |
Sketchpad |
Activity |
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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. ...
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Determining the Uniqueness of ...
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Circles (Geometry) |
Sketchpad |
Activity |
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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...
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Diagonals of a Rhombus
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Rhombus (Geometry) |
Sketchpad |
Activity |
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[0]
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A guided exploration, using Geometer's Sketchpad, of the construction and diagonals of a rhombus.
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Dueling Pinwheels
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Reflection (Geometry)+ |
Sketchpad |
Activity |
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This contains construction directions for rotations, translation, and reflection, with questions to explore and a demonstration sketch to download at an introductory Sketchpad level.
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Equations of Lines
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Line (Geometry)+ |
Sketchpad |
Activity |
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A guided exploration, using Geometer's Sketchpad, of a line on the coordinate plane, and its slope.
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Examining Angles in Polygons
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Polygons (Geometry) |
Sketchpad |
Activity |
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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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Exploring Centers of a Triangl...
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Centers of triangles (Geometry) |
Sketchpad |
Activity |
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[0]
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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...
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Exploring Centers of a Triangl...
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Centers of triangles (Geometry) |
Sketchpad |
Activity |
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[0]
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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...
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