Jawabanmu

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2014-04-13T11:50:25+07:00
Luas lingkaran = pi x r x r
6,6 = 3,14 x r²
6,6 = 3,14r²
r²  = 6,6 : 3,14
r²  = 2,10191083
r = √2,10191083
r = 1,44979682 m
1 5 1
2014-04-13T11:51:02+07:00
L =  \pi  r^{2}
 6,6^{2} m^{2}   = 3,14 x  r^{2}
 r^{2}  \frac{6,6}{3,14}  m^{2}
 r^{2}  2\frac{16}{157}
r = 1,449796823