it is pi..... wait no it isnt.....pi squared to the one half power is not pi...
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This is the equation of a semi-circle, or a half circle.
(pi) R2 x 34 = 81 pi R2
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
The area of a full circle is pi x R squared where R = RADIUS The area of a semi circle is half of that, or pi x R squared/2
pi times the radius squared pi r squared