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Tool: Area and perimeter of a rectangle (Coordinate Geometry) - Math Open Reference
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A web page and interactive (Flash) applet demonstrating the reflection transformation. Drag the vertices of a triangle and re-position the line of reflection. The reflected image of the triangle is updated as they drag.

Optionally, user can turn on lines showing the distances from the vertices of the original and the image, demonstrating that they are congruent at all times.

Applet can be enlarged to full screen size for use with a classroom projector. After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This resource is a component of the Math Open Reference interactive geometry reference book project at

Technology Type: Flash 
Author: John Page
Language: English 
Cost: Does not require payment for use

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Courses: Math 4 Reflections
Math 5 Reflections
Math 6 Reflections
Math 7 Reflections
Geometry Reflection

Teacher Review (Based on classroom experience)
Reviewer: WandaB, Aug 26 2009 06:28:10:977PM
What did students learn? Students were able to visualize reflections and manipulate the applet to develop a deeper understanding.
Recommended for: Geometry: Transformations and symmetry
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