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b)(1,8)2*3.14=
c)4*3,14=
b) d - 3,6 r=1,8
3,24 π = 10,17 j² w przyblizeniu ;D
c)
2 π r= 4π| : 2 π
r= 2 π ;D
πr²= π2π² = 4π²