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360 = p x 18
360/18 = p
p = 20 cm
K = 2 x (p+l)
2 x (20+18) = 2 x 38 = 76 cm (d)
= 20cm
keliling = 2p+2l
= 2(20) + 2(18)
= 40+36
= 76cm (D)