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72 = 4 x s
72 : 4 = s
18 = s
tinggi sisi miring segitiga = √9² + 12² = √81 + 144 = √225 = 15
L.limas = L.a + 4 L.segitiga
= 18.18 + 4.1/2.18.15
= 324 + 540 = 864 cm²
itu jawabannya kalo gasalhyaa