Jawabanmu

2014-08-27T17:38:42+07:00
Diameter kolam sebenaranya = 4 kali 200 = 800, jari-jari = 400 cm
luas lingkaran = pi kali jari-jari kuadrat
= 3,14 kali (400) kuadrat = 3,14 kali 160000 = 502400 cm
1 4 1
2014-08-27T17:39:06+07:00
L=πr²
=3.14x2x2
=12.56cm²
(r=1/2x4=2)