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maaf kalo salah
60 = 1/2 x 8 x t
60 = 4t
60/4 = t
15 = t
sisi miring alas = √8² + 15²
= √289
= 17
Luas permukaan = (2.60) + (30.8) + (30.17) + (30.15)
= 120 + 240 + 510 + 450
= 1320 cm²
semoga membantu :)