Obwod d=1/4*2πr=1/2πr
d≈1/2*3,14*30=15*3,14=31,4+15,7=47,1 cm
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Obwod d=1/4*2πr=1/2πr
d≈1/2*3,14*30=15*3,14=31,4+15,7=47,1 cm