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luas persegi panjang = 16 cm x 4 cm
= 64
64 : 2
= 32 cm
Keliling = sisi x 4
= 32 cm x 4
= 128 cm
= 2×(16+4)
= 2×20
= 40cm
jadi kelilingnya adalah 40cm
jadikan jawaban terbaik ya :)