Jawabanmu

2014-06-10T20:56:56+07:00
Keliling lingkaran =  \pi x d
440 m =  \frac{22}{7} x d
d = 440 x  \frac{7}{22}
d = 140 m

a. jari jari =  \frac{1}{2} x d =  \frac{1}{2} x 140 = 70 m
b. diameter = 140 m
c. luas =  \pi  r^{2} =  \frac{22}{7} x 70^{2} = 15.400  m^{2}
2014-06-10T20:59:34+07:00
A)k=2phi.r
440=2.22/7.r
440=44/7.r
440.7=44.r
3.080=44.r
r=3.080/44
r=70
c)L=phi×r×r
=22/7×70×70
=107.800/7
=15.400