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L / 2π=r
r=L / 2π // : dzielimy obustronnie
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P=cd / 2
cd=2P // :c
d=2P/c
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P=πr (r+l)
P=πr² + πrl
P-πr²=πrl // : πr
(P-πr²) / πr=l
l=(P-πr²) / πr
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P=πr² // : π
P / π=r²
r= - √(P/π) ∨ r=√(P/π)