Sophia Learning
Sophia: Scale Factor and Area of Similar Figures: Lesson 3
This lesson will discuss the relationship between scale factor and area of similar figures. It is 3 of 5 in the series titled "Scale Factor and Area of 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: 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: Solving Proportions
[Free Registration/Login Required] This lesson introduces the cross product method for solving proportions. It also connects the mathematical content to real-world applications.
Math Is Fun
Math Is Fun: Similar
Students investigate when two shapes are similar. Definitions and examples 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: Similarity and Congruence
This site from Dr. Math at the Math Forum provides a collection of problems and exercises that require knowledge of the relations between similar or congruent shapes. Solutions are provided.
Wolfram Research
Wolfram Math World: Math World: Geometric Similarity: Similar
A definition for similar figures, directly similar, and inversely similar figures in Mathematics. Provides pictures to aid understanding.
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.
National Council of Teachers of Mathematics
Nctm: Figure This: Nctm Math Challenge Three Squares (Pdf)
If you think you can handle the Pythagorean Theorem, then this is a math challenge you should try. Explore geometric relationships and measurement in this one page activity from the NCTM Math Challenges for Families series.
SMART Technologies
Smart: Same Different Shape Color Matching
Students will identify similarities and differences using colors and shapes in this whiteboard lesson provided by SMART.