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O=2πr
O=2*12,5π =25πcm
2.
O=πd
O=40π dm
3.
2πr=14π /:2π
r=7
4.
r=45cm
O=2*45π =90*3 =270cm=2,7m
9km=9000m
9000/2,7 =3333 1/3 ≈3333 pełnych obrotów
5.
r=3 1/2 dm =3,5dm
P=πr²
P=3,5²π =12,25π dm²
6.
r=6,4:2 =3,2 cm
P=3,2²π =10,24π cm²
7.
πr²=25π /:π
r=√25
r=5
8.
2πr=44π /:2π
r=22
P=22²π =484π [j²]
9.
r=√64
r=8
O=2*8π
O=16π