Assuming you're using pi in the classic geometric sense, the ratio of a circle's circumference to it's diameter, then derivative of the expression would be 0 as it has no rate of change.
If you intend to use pi as a variable, then it's derivative would be 2pi.
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it is pi..... wait no it isnt.....pi squared to the one half power is not pi...
pi times the radius squared pi r squared
Area of a circle = pi*radius2 measured in square units
SA=2(pi times r squared) + h(pi 2 r) or (easier way) 2 pi r squared + 2 pi r h
Pi r squared is the formula for the area of a circle. 2 pi r squared is twice that.