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Surf for More Math

Lesson 5 - Exploring Perimeter

To encourage your child to have fun on the Web while learning about Exploring Perimeter, here are some games and interactive activities they can do on their own or in pairs.



Explore the relationship between perimeter and area measurements.


Builds Upon

Student Book page 154

Instructions for Use

Touch Pegs lets your child investigate perimeters of rectangles.

To use Touch Pegs, select a circle by holding the mouse button down, and drag it to any location on the gird. Release the circle to anchor it. A red node appears at the top of the circle. Click on any part of the circle and drag it in any direction. It will stretch much like a rubber band. Secure the band to any points on the grid to make rectangles.

Click on the circle again to add other bands. To colour the rectangle, click first on it and then on the colour buttons to the left. To release a node, hold the Ctrl key down and click on the node. Click on the 'Measure' button to determine the perimeter of the rectangle. Click on the 'Clear' button to start the exercise over again.


Perimeter Explorer allows your child to measure the perimeter of a random shape on a grid.

To use Perimeter Explorer, input a number, greater than 1 and less than 50, in the shape area text box. Click the 'Draw New Shape' button. Have your child input the answer in the shape's perimeter text box. Click the button 'Check Answer" to find the result.

To change the area of the figure, slide the 'Adjust Area' scroll bar, and click the 'Draw New Shape' button.