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54 = 1x . 3x /2
54 = 3x² /2
54.2 = 3x²
108 = 3x²
108/3 = x²
36 = x²
√36 = x
6 = x
jadi panjang diagonal BD = 3.6 = 18 cm
AC = cm
maaf kalo salah
tolong jadikan jawaban terbaik