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pp = 3000 : 250 = 12 cm
lp = 1500 : 250 = 6
kp = (pp + lp) x 2 = (12 + 6) x 2 = 36 cm
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L x 30 = 450
L = 450/30 = 15m
Keliling = 2 ( P + L)
= 2 ( 30 + 15)
= 2 ( 45)
= 90m = 9.000cm
Keliling gambar = 9.000cm /1.250 = 36cm