Stage: 3 Challenge Level: 
An AP rectangle is one whose area is numerically equal to its perimeter. For example the rectangle 10 units by 2.5 units has area 25 square units and perimeter 25 units. If you are given the length of a side can you always find an AP rectangle with one side the given length? Explain your answer.
Visualising. Perimeters. Creating expressions/formulae. Formulae. Linear equations. Mathematical reasoning & proof. Interactivities. Algebra - generally. Generalising. Rectangles.
Published September 2000.
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