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# Online games, tutorials, and activities for congruent transformations

This is an annotated and hand-picked list of online games, tutorials, and activities for congruent transformations in geometry (reflection, rotation, and translation).

## Congruent Transformations

Primary Resources: Reflection
Color the squares and reflect the given pattern in a line.
www.primaryresources.co.uk/online/reflection.swf

Primary Resources: Rotation
From the arrow you can change the shape. Use the circular arrow buttons to rotate the shapes either 90 or 45 degrees.
www.primaryresources.co.uk/online/rotation.swf

Symmetry Game
Tell how many lines of symmetry a shape has.
www.innovationslearning.co.uk/subjects/maths/activities/year3/symmetry/shape_game.asp

Online Kaleidoscope
Create your own kaleidoscope creation with this interactive tool.
www.zefrank.com/dtoy_vs_byokal

Similarity and Congruence
An interactive lesson with explanations and quiz from Absorb Mathematics course written by Kadie Armstrong, a mathematician.
www.absorblearning.com/mathematics/demo/units/KCA035.html

 Dr. Math Introduces Geometry: Learning Geometry is Easy! Just ask Dr. Math! A supplement to middle school geometry, Dr. Math Introduces Geometry has a light tone, clear layout, and humorous cartoons by Jessica Wolk-Stanley. The best part is that the explanations to math questions are accurate and clear. You'll find answers to dozens of real questions from students who needed help understanding the basic concepts of geometry. This book covers angles, triangles, quadrilaterals, area, perimeter, Pi, circle parts, polyhedra, surface area, volume, nets, congruent transformations, and symmetry. Price ~\$12 new, ~\$1-6 used.

Maisonet Math
Worksheets and online quizzes on a variety of geometry (and other) topics. Look for the links in the left sidebar for Angles, Area, Circumference, Geometry, Transformations, and Volume.
www.mrmaisonet.com

National Library of Virtual Manipulatives for Interactive Mathematics: Geometry
Collection of interactive geometry activities: Congruent triangles, fractals, geoboard activities, Golden rectangle, Ladybug leaf, Ladybug mazes, platonic solids, tangrams, tessellations, transformations and more.
nlvm.usu.edu/en/nav/category_g_3_t_3.html

Recognizing Transformations
A ready-to-use lesson that introduces students to the world of symmetry and rotation in figures and patterns. Students learn how to recognize and classify symmetry in decorative figures and frieze patterns, and get the chance to create and classify their own figures and patterns using interactive applets.
http://illuminations.nctm.org/Lesson.aspx?id=2591

Transformations
Use these interactive figures to explore geometric transformations (rotations, translations, and reflections AND a composition of these.
www.nctm.org/standards/content.aspx?id=26885

Harold Jacobs Geometry
A popular choice for a geometry textbook among homeschoolers, and well written. Please read my review.