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it is pi..... wait no it isnt.....pi squared to the one half power is not pi...
This is the equation of a semi-circle, or a half circle.
Radius squared is half of the diameter multiplied by itself. Example: diameter is 6 inches, radius is 3 inches (half of diameter), radius squared is 9 inches (radius multiplied by itself 3 x 3 = 9).
area=pi r squared the r is the radius which is half of the diameter so area =pi mulitplied by 45 squared which is 6361.725124mm
You label it with an exponent 2, because it is squared-half of a square.... YALL SHOOD NO DAT.