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r=22.7/44
=3.5
b. r=31,4/2.3,14
=31,4/6,28
=5
c.luasO=22/7.rkuadrat
rkuadrat=154/22/7
=154.7/22
=49
r=akar49
=7
d. rkuadrat=346,5/3,14
=110,25
r=akar110,25
=10,5
r =138,16 cm
r = 5 cm
r = 7 cm
r=10,5