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r=promień
2r= średnica
pole=½×2rh
30=r×10
r=30:10
r=3cm
l=√(3²+10²=√9+100=√109cm= tworząca
½*2r*H= ½*10*2r = 30 => r = 3
l=√(h²+r²) => l=√109