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648:18 = 36
keliling= 2x (p+l)
=2x (36+18)
= 2x 54
= 108
648 = p x 18 cm
p = 648 ÷ 18
p = 36
K = 2p + 2l
= 2x38 + 2x18
= 76 + 36
= 112
jadi keliling nya 112 cm