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P=πd
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Jeśli znamy średnicę koła/okręgu możemy obliczyć długość okręgu lub obwód koła
L=2πr
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Jeśli znamy promień możemy obliczyć długość okręgu obwód koła
P=πr²
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Jeśli znamy promień możemy obliczyć pole koła
Co to średnica?
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Średnica to 2 razy promień, czyli r+r=d
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