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AC^2 = (3a)^2 + (3a)^2
AC^2 = 9a^2 + 9a^2
AC^2 = √18a^2
AC = 3a√2
AO = 1/2 AC
AO = 1/2 . 3a√2
AO = 3a/2√2
Jadi, jarak A ke bidang BCD adalah 3a/2√2 cm
Semoga membantu
Jadikan jawaban terbaik ya, terimakasih ^^