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Proof as Verification: Areas

Quadrilaterals (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 ...
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Relationships Between Area and...

Quadrilaterals (Geometry) 
Excel 
Lesson Plan 

[0]

In this activity, students explore the relationships between area and perimeter by fixing one value and maximizing the other. Students will explore the relationship between perimeter and area of recta...
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Area of a Rectangle (Geometry)

Quadrilaterals (Geometry) 
Flash 
Support Material 

[0]

This minilesson explains the formula used to calculate the area of a rectangle.
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Area of a Rhombus (Geometry)

Quadrilaterals (Geometry) 
Flash 
Support Material 

[0]

This mini lesson explains the formula used to calculate the area of a rhombus.
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Area of a Square (Geometry)

Quadrilaterals (Geometry) 
Flash 
Support Material 

[0]

This mini lesson explains the formula used to calculate the area of a square.
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Area of a Trapezoid (Geometry)

Quadrilaterals (Geometry) 
Flash 
Support Material 

[0]

This mini lesson explains the formula used to calculate the area of a trapezoid.
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The Geometer's Sketchpad  3 L...

Quadrilaterals (Geometry) 
Computer 
Tool 

[0]

With Geometer's Sketchpad you can open these applets and do the three labs on rotation/translation, area of a parallelogram, and area of a rectangle.
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Area and Perimeter  PDA versi...

Quadrilaterals (Geometry) 
Flash 
Tool 

[0]

This activity is designed to support the understanding of perimeter and area, and to run on PDAs.
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XP Math: Finding Areas of Para...

Quadrilaterals (Geometry) 
Flash 
Tool 

[0]

In this game, students race the clock to find the areas (with units) of parallelograms.
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XP Math: Finding Perimeters of...

Quadrilaterals (Geometry) 
Flash 
Tool 

[0]

In this game, students race the clock to find perimeters of parallelograms.
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Area of a Square  Math Open ...

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that demonstrate the area of a square.
The applet shows a square with all vertices draggable. As you drag any one, the area id continuously calculat...
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Area of a Kite  Math Open Ref...

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

An interactive applet and associated web page that deals with the area of a kite, (a quadrilateral with two distinct pairs of equal adjacent sides).
The applet shows a kite and the user can reshap...
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Area of a Parallelogram

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[1]

Illustrates and defines the formula for the area of a parallelogram. From Illuminations' IGD: Interactive Geometry Dictionary.
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Area of a Rectangle

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

Illustrates and defines the formula for the area of a rectangle. From Illuminations' IGD: Interactive Geometry Dictionary.
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Area of a Rectangle  Math Ope...

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet showing the ways to calculate the area of a rectangle. The user can drag the vertices of the rectangle and the other points change automatically to ensure it rem...
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Basic Areas  of a Rectangle a...

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[1]

This applet has you manipulate a rectangle and triangle in order to discover the area formulas.
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Constructing Right Triangles

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

Provides two applets that demonstrate how to construct right triangles with different sets of given information
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Dividing a Quadrilateral

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

This applet demonstrates how to divide a quadrilateral into two equal halves.
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Geoboard  Coordinate

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

Rectangular geoboard with x and y coordinates.
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Perimeter of a Quadrilateral

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

This applet demonstrates the rule of the perimeter of a quadrilateral.
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Perimeter of a parallelogram ...

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

A web page and interactive applet show how to compute the perimeter of a parallelogram.
A parallelogram is shown that can be resized by dragging its vertices. As you drag, the perimeter is cont...
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Right Angles

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

Provides an applet that demonstrates how to construct right angle using a straightedge and a compass.
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Special Triangles

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

Provides an applet that demonstrates how to construct triangle given the lengths of the sides.
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The Area of a Trapezium

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

This applet demonstrates the source of the area formula for the trapezium.
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Two Squares  Maximum Area

Quadrilaterals (Geometry) 
Java Applet 
Tool 

[0]

This applet has a corresponding problem that deals with maximizing the area of two overlapping squares.
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