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Verified answer
L.layang² = 1/2 x d¹ x d²2.592 = 1/2 x 81 x d²
5.184 = 81 d²
d² = 5.184 : 81 = 64 cm
2592 = 81 x d2 /2
5184 = 81 x d2
D2 = 5184/81
D2 = 64
Panjang diagonal lain = 64