A=1/2*pi*r2

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Solution for A=1/2*pi*r2 equation: 


x in (-oo:+oo)

A = (1/2)*pi*r^2 // - (1/2)*pi*r^2

A-((1/2)*pi*r^2) = 0

A+(-1/2)*pi*r^2 = 0

A-1/2*pi*r^2 = 0

x należy do R

x in (-oo:+oo)

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