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keliling = 2 x 100.000 + 2 x 998
= 200.000 +1996
= 201.996 dm
luas = 100.000 x 998
= 99.800.000
2. 10,2 km = 1.020.000 m
keliling = 2 x 1.020.000 + 2 x 60
= 2.040.000 + 120
= 1.040.120
luas = 1.020.000 x 60
= 61.200.000