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Derived units are the units which are derived from the fundamental units. 

Area of rectangle = length×breadth
SI unit of length = m
SI unit of breadth = m
SI unit of area = m×m = m²
Dimensional formula = [M^0 L^2 T^0]

speed = distance/time
SI unit of distance = m
SI unit of time = s
SI unit of area = m/s 
Dimensional formula = [M^0 L^1 T^(-1)]
2 5 2