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6cmkali1000=60m
keliling(60+100)kali2=320
luas. 60kali100=6000m²
2. 16kali1000=160m
kel 16 kali4=64
luas 16²=256m²
3. 28kali1000=280m
kel22/7kali28=88
luas22/7kali28kali28=2464
semoga dapat nilai 100