Dictionary
search :       browse : 
A B C D E F G H I J K L M
  N O P Q R S T U V W X Y Z
         
Description
Related Terms
Everyday Examples
Interactive Checkpoint
More Information
Challenge
How to use this dictionary
Contact
 Challenge
 Concentric:  Refers to circles that have the same center.

Target Areas: Determine the area of a target formed by concentric circles.