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30 = PL
4P = 30
P = 30 / 4
P = 7,5 m
Keliling persegi = 2P + 2L
= 2(7,5) + 2(4)
= 15 + 8
= 23 m
keliling = 2 × (7,5 + 4)
= 2 × 11,5
= 23 cm