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More Math Activities  EnchantedLearning.com Perimeter 
Figure  Perimeter  

Square  4 * a  
Rectangle  2 * (a+b)  
Circle  2πr 
The perimeter of a square is 4 times the length of a side. The perimeter of a rectangle is 2 times the sum of the length plus the height. The perimeter of a circle is 2 times π times the radius.
Introduction to Perimeters  Worksheets to Print
Perimeter of Rectangles Printout Determine the perimeter of the rectangles on this printable worksheet. Or go to the answers. 
Perimeter of Grids Printout Determine the perimeter of the irregular rectangular grids on this printable worksheet. Or go to the answers. 
Pumpkin Patch Perimeters: All Around the Farm A Printable Book A short, printable book about perimeters, using pumpkin patch terms, including the perimeters of a pumpkin patch, chicken coop, pigpen, corn field, goat pen, horse corral, barnyard, and vegetable garden. 
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