Finding the Perimeter of Rectangles

Online

ExploreLearning: Rectangle - Perimeter and Area

http://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=235

The ExploreLearning: Rectangle - Perimeter and Area Gizmo is a simple, but powerful tool that can be used in many ways. Options are available to manipulate the side length of either a square or a rectangle. The user can choose to reveal the perimeter or area of the shape, based on the length of the sides; or they can activate the rulers, and measure each side, and use the formulas they know for calculating the perimeter.

Shodor Interactive: Perimeter Explorer

http://www.shodor.org/interactivate/activities/permarea/index.html

The Shodor Interactive: Perimeter Explorer is a manipulative that allows the user to generate a random geometric shape with a defined area, and solve for the perimeter. The user can define whether they would like to have a rectangular or non-rectangular shape displayed. The applet also has the ability to outline the shape to offer visual support to create a boundary.

NLVM: Geoboard & Geoboard Coordinate

http://nlvm.usu.edu/en/nav/topic_t_3.html

These two Geoboards are great. Use the bands to create different shapes. Click the Measures button to display/hide the Perimeter and Area of the selected shape. The Geoboard Coordinate incorporates a coordinate plane and ordered pairs into the activity.

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