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You can't tell the area from knowing the perimeter. There are an infinite

number of different rectangles, all with the same perimeter, that all have

different areas.

Here are a few rectangles that all have perimeters of 42.

The last number after each one is its area:

1 cm by 20 cm . . . . . 20 square centimeters

2 x 19 . . . . . 38

3 x 18 . . . . . 54

4 x 17 . . . . . 68

5 x 16 . . . . . 80

10 x 11 . . . 110

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Q: What is the area of a rectangle with a perimeter of 42cm?
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