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p = 3 m = 300 cm
l = 15 dm = 150 cm
t = 140 cm
r = 4(p + l + t)
r = 4(300 + 150 + 140)
r = 4 . 590
r = 2360 cm
r = 23,60 m
Sisa kawat = panjang kawat – r
Sisa kawat = 24 m – 23,6 m
Sisa kawat = 0,4 m = 40 cm
3 m = 3 × 100 = 300 cm
15 dm = 15 × 10 = 150 cm
dan 140 cm
jadi = 2.400 - ( 300 + 150 + 140 )
= 2.400 - 590
= 1810 cm / 18,1 m
terima kasih ^_^