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Calculate the Area of an Ellipse

a = pi * r₁ * r₂

definitions

a	=	area of the ellipse
r₁	=	length of the semi-major axis
r₂	=	length of the semi-minor axis
pi	=	Π, approximately 3.1415927

	r₁, semi-major axis

	r₂, semi-minor axis

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