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Pitagorasem liczysz promień koła (nie kuli)
3² + x² = 5²
9 + x² = 25
x² = 16
x = √16
x = 4
I jak masz promień koła to można obliczyć jego pole powierzchni.
P = πr²
P = π4²
P = 16π cm²
3 do kwadratu + x do kwadratu =5 do kwadratu
x=4
P=pi r do kwadratu
P= 16pi