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Obwód l=2πr
Pole : P=πr²
a)16pi cm2 => r=√16=4
l=2*π*4 = 8 π cm
B)4/9pi m2 => r=√4/9 = 2/3
l=2*π*2/3= 4/3 *π m
c)0,25pi mm2 => r=√0,25 = 0,5
l=2*π*0,5=π mm
d)2pi dm2 => r=√2
l=2*π*√2 dm
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