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keliling = 4xS
100 = 4x S
S = 25 m
skala = x : 2500 cm
skala = 2,5 : 2500
L = 2,5 x 2,5 = 6,25 cm2
4s = 100
s = 25 m = 2500 cm
skala 1:10.000
s pada denah = 2500/10000 = 0,25 cm
luas pada denah = s x s
= 0,25 x0,25
= 0,0625 cm²