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tinggi segitiga = √(9² + 12²)
= √(81 + 144)
= √(225)
= 15
luas alas = r²
= 18²
= 324
jumlah luas selimut = 4× 1/2 . a . t
= 2 . 18 . 15
= 540
luas permukaan limas = luas alas + jumlah luas selimut
= 324 + 540
= 864 cm²