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a)
obwód koła___________________Pole koła
l=2πr/:2π_________________________P=πr²
r=l/2π
l=16π cm
r=16πcm/2π=8cm_____________P=πx(8cm)²=64πcm²
l=0,12π mm
r=0,12π mm/2π=0,06mm______P=π×(o,06mm)²=0,0036πmm²
l=2/3π km
r=2/3π km:2π
r=2/3π km×¹/₂π=¹/₃km_______P=π×(1/3km)²=1/9πkm²
l=4π dm
r=4π dm/2π=2dm____________P=π×(2dm)²=4πdm²
pole koła_________________________obwód koła
P=πr²_____________________________l=2πr
r=√P/π
b)
P=16π cm²
r=√16π cm²/π=4cm___________________l=2xπx4cm=8π cm
P=4/9π m²
r=√4/9π m²/π=²/₃m________________l=2xπx²/₃m=⁴/₃πm=1¹/₃π m
P=0,25π mm²
r=√0,25π mm²/π=0,5mm_____________l=2xπx0,5mm=1π mm
P=2π dm²
r=√2π dm²/π≈1,41dm________________l=2xπx1,41dm≈2,82π dm
P=3ππ km²
r=√3 km² /π≈1,73km_______________l=2xπx1,73km≈3,46π km
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