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l=2rπ
l=πd
b) l=2πr
r=l/2π
P=πr²
P=πl²/4π²
P=l²/4π
c) P=πr²
r²=P/π
r=√(P/π)
r=(√(Pπ))/π
d=2r
d=(2√(Pπ))/π
d) P=πr²
r²=P/π
r=√(P/π)
r=(√(Pπ))/π
l=2πr
l=2√(Pπ)
l=2π√(P/π)