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L. segitiga = 18.24/2 = 216
l. total = 360 + 216 = 576
= 30 x 12
= 360 cm²
L.2 = x a x t
= x 24 x 18
= 216 cm²
L.bangun = L.1 + L.2
= 360 + 216
= 576 cm²