Jawabanmu

2014-09-08T18:24:00+07:00
Keliling = π×d
44 = (22/7)×d
d = 44 : 22/7 = 44 × 7/22 = 14 cm

r = 14 cm ÷ 2 = 7 cm
2014-09-08T18:27:16+07:00
K = 2. \pi .r
k = 44 cm
44 = 2. \frac{22}{7} .r
44 =  \frac{44}{7} r
r =  \frac{44}{7}:44
r =  \frac{44}{7} :  \frac{44}{1}
r =  \frac{7}{44}. \frac{44}{1}   =  \frac{308}{44}= 7
r= 7
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