First you need to make each dimension the same unit. I would pick meters.
385 cm= 0.385 m
4.5 m= 4.5 m
Then, you multiply and place the decimal. The answer will be in square meters.
1.7325 square meters
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Area = length x width Length = area/width
If Length * Width = Area, then Area ÷ width = Length
Area = (length) times (width)Length = (area) divided by (width)Width = (area) divided by (length)
Area of a rectangle = length x width Area = 9 m x 8 m Area = 72 m2 = 72 square metres
Length times width equals area