Science U
Science U: Isometries: Rotation
This site from Science U gives good examples of rotational symmetry and some background information about them.
Wolfram Research
Wolfram Math World: Semiregular Tessellations
This one page Mathworld site has a number of examples of semiregular tessellations. A definition and a small amount of related information is given at the bottom of the page.
Math Is Fun
Math Is Fun: Definition of Congruent
Definition of congruent. Choose the "here's more" link to see examples of a rotation, reflection and translation.
The Math League
The Math League: Similar Figures
This tutorial explains what similar figures are in geometry and provides examples.
Instituto Latinoamericano de la Comunicacion Educativa
Red Escolar: Recortando Geometria
In Spanish. In this site you will find different activities involving geometric plane figures.
Instituto Latinoamericano de la Comunicacion Educativa
Red Escolar: Simetrias
In Spanish. This activity is to create different figures which are symmetrical, and also find and learn about other types of symmetries.
Sophia Learning
Sophia: Corresponding Parts: Lesson 5
This lesson will define the phrase corresponding parts (e.g. angles, sides, etc.). It is 5 of 5 in the series titled "Corresponding Parts."
Sophia Learning
Sophia: Rotating on a Coordinate Plane: Lesson 2
This lesson demonstrates how an object can be rotated in space and on a coordinate plane about different points. It is 2 of 5 in the series titled "Rotating On a Coordinate Plane."
Sophia Learning
Sophia: Similar Solids and Similar Figures: Lesson 4
This lesson explains how similar solids are related to similar figures in two-dimensions. It is 4 of 5 in the series titled "Similar Solids and Similar Figures."
Sophia Learning
Sophia: Similar Figures: Lesson 4
This lesson defines the phrase similar figures. It is 4 of 6 in the series titled "Similar Figures."
ClassFlow
Class Flow: Pentominoes
[Free Registration/Login Required] Students use geometric sense to create congruent shapes and figures in multiple orientations using transformations.
ClassFlow
Class Flow: Similar Figures
[Free Registration/Login Required] This flipchart is designed to introduce proportional relationships between similar figures. It also introduces the concept of scale factor.
ClassFlow
Class Flow: Transformations
[Free Registration/Login Required] In this flipchart, students apply multiple transformations to create congruent and similar figures in any or all of the four quadrants. Students apply their geometric sense by using multiple...
Free Math Help
Free Math Help: Trapezoids
The lesson discusses trapezoids. The resource consists of an explanation, diagrams, and practice problems with solutions.
ClassFlow
Class Flow: Geometry Polygons
[Free Registration/Login Required] This flipchart discusses plane figures and solid figures. The definitions and lesson sequence are based on Scott Foresman's Grade 4 Math textbook.
Math Is Fun
Math Is Fun: Similar
Students investigate when two shapes are similar. Definitions and examples are included.
Shmoop University
Shmoop: Basic Geometry: Quadrilaterals
The geometry resource explores quadrilaterals. Descriptions, examples, and practice exercises are included.
Shmoop University
Shmoop: Basic Geometry: Similar Figures
The geometry resource explores similar figures. Notes, examples, and practice exercises are included.
National Council of Teachers of Mathematics
The Math Forum: The Four Basic Symmetries
This is a site from the Math Forum that gives visual examples to show the differences between the four different kinds of symmetry. Examples are given along with links to additional information.
National Council of Teachers of Mathematics
Nctm: Figure This: Fire Hydrant
Discover how the geometric shape of an object directly relates to its usefullness in this math challenge from the NCTM Math Challenges for Families collection. A one page activity that you can print or download.
Wolfram Research
Wolfram Math World: Geometric and Direct Similarity
This site contains a definition of the concept "directly similar." There are links to other defintions on this page. Great for reference.
Math Words
Math words.com: Rotation
A basic definition of what rotation is at this site from MathWords.com. Provides a diagram to illustrate the concept. Links to other related concepts included.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: Giros en El Reloj
Discover the different types of figures you can make by moving n numbers of minutes around a clock.
Mathigon
Mathigon: Geometry: Transformations and Symmetry: Dilations
This lesson focuses on dilations, a dilation is a transformation that resizes a geometric shape, by making it bigger or smaller.