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a 2[pi]r = 18 cm
[pi]r = 9 cm
r = 9/pi cm
b 2[pi]r = 49 cm
r = 24,5/pi cm
c 2[pi]r = 0,12cm
r = 0,6 / pi cm
d 2[pi]r = 6i 2/3
r = [3 i 1/3] / pi
e 2[pi]r = 62,8cm
[przyjmujac za pi 3,14]
[pi]r = 31,4
r = 10 cm
f 2[pi]r = 0,037cm
[pi]r = 0,0185
r = 0,0185 / pi cm
1) O=18cm r=18/2*3,14=2,86 cm
2) O = 49cm r=49/2*3,14=7,8 cm
3) O=0,12 cm r= 0,12/6,28=0,019 cm
4) O=6⅔ cm r= 6⅔/6,28=1,06 cm
5) O = 62,8 cm r= 62,8/6,28=10 cm
6) O=0,037 cm r=0,037/6,28=0,0059 cm