4 cm
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In a rectangle, the area is calculated by multiplying length x width. If (for example) both length and width are in centimeters, the area will be in square centimeters.
8.2 cm
450 square centimeters
If the area of a rectangle is found by measuring the length times the width, then if you know the area is 256 and the width is 8, you find the length by dividing 256 by 8 which would give you a length of 32 centimeters.
If the rectangle is a square, the perimeter is 48 cm. If not, there are a lot of possibilities.