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= (12√3*12√3*12√3)÷(4*(a*t/2))
= 5184√3÷(4*(12√3*18/2))
= 5184√3÷(4*216√3/2)
= 5184√3÷432√3
=12 cm
penjelasan pencarian tinggi segitiga= √sisi miring²-alas²
= √12√3²-(12√3/2)²
= √432-108
= √324 = 18 cm