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L = 1/2 . d1 . d2
432 = 1/2 . 2/3 . d2 . d2
432 = 2/6 . d2²
432 . 6 / 2 = d2²
1296 = d2²
d2 = √1296
d2 = 36 cm
d1 = 2/3 d2
= 2/3 . 36
= 24 cm
Jadi, panjang diagonalnya adalah 24 dm dan 36 dm