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Math Is Fun
Math Is Fun: Area of Plane Shapes
The resource consists of area formulas and diagrams for a variety of shapes.
George Mason University
Area Formula Lab
In this set of worksheet activities, students will be guided to discover formulas for area of polygonal shapes and circles.
Shodor Education Foundation
Shodor Interactivate: Shape Explorer: Area and Perimeter
An applet activity that provides an exercise in working with perimeter and area of 2D objects. The user is given a random figure and allowed to enter a value for the area and perimeter. Use the "How" and the "Why" button to assist you....