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Verified answer
P = 20 cml = 14 cm
t = 9 cm
kawat yang dibutuhkan =
4 × 20 + 4 × 14 + 4 × 9 =
80 + 56 + 36 = 172
2 m = 200 cm
kawat yang tidak terpakai = 200 - 172 = 28 cm
= 200-4(20+14+9)
=200-4(43)
=200-172
=28 cm