P=0,64πcm²
P=πr²
πr²=0,64πcm²|:π
r²=0,64cm²
r=√0,64cm²
r=0,8cm
l=2πr
l=2π*0,8cm
l=1,6πcm
πr²=o,64π
r²=0,64
r=0,8
l=2π*0,8
l=1,6π
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P=0,64πcm²
P=πr²
πr²=0,64πcm²|:π
r²=0,64cm²
r=√0,64cm²
r=0,8cm
l=2πr
l=2π*0,8cm
l=1,6πcm
P=πr²
πr²=o,64π
r²=0,64
r=0,8
l=2πr
l=2π*0,8
l=1,6π