iKnowthat.com has multimedia educational games for kids ages 2-12.

Bucky's Blueprints Perimeters and Areas Game

In this activity, Bucky's Blueprints, children calculate areas and perimeters of different geometric figures such as squares, triangles, trapezoids, parallelograms, and other straight-sided shapes.  Two of the word problem sets include calculating the perimeter and area of circles. The figures are based on parts of structures such as a house, barn, gazebo, jungle gym, and even a go-cart.  Labeled illustrations go along with each word problem so children have clear visual references to help them construct and carry out the proper calculation. 

As they move through a word problem set, children can "build" their own structures by choosing colors and textures for different parts.  When a word problem set is finished, a personalized certificate is displayed that includes the structure.

Bucky's Blueprints is a fun way for children in elementary grades to learn to apply measurement skills as they relate to shapes and geometric figures.