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'Can They Be Equal?' printed from http://nrich.maths.org/
Find the dimensions of the following rectangles:
Dimensions 
Area 
Perimeter 

9 
20 

16 
20 

21 
20 

24 
20 

25 
20 
Draw the rectangles.
What do you notice about the shapes of rectangles with a
fixed perimeter as their areas
increase?
Find the dimensions of the following rectangles:
Dimensions 
Area 
Perimeter 

24 
20 

24 
22 

24 
28 

24 
50 
Draw the rectangles.
What do you notice about the shapes of rectangles with a fixed
area as their perimeters increase?