Assuming you're area is 30ft^2, you can't tell simply from that. It could be anything, so long as the product of it and the width is 30.
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Take the length times width; I assume the dimensions are in feet so 30 X 30 feet is 900 square feet.
The area of rectangle is : 30.0
4 feet
690 square feet. This is an easy calculation - just multiply the length in feet by the width in feet. The answer is the number of square feet.
area = width x height = 30 square feet ( not feet) 5 x height = 30 height = 6 feet perimeter = 2 width + 2 height = 10 + 12 = 22 feet