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63=1/2×9 × d2
63=9d2/2
126=9d2
d2=126/9
d2=14
63 = 1/2 x 9 x d2
63 x 2 = 9 x d2
9d2 = 126
d2 = 14cm
Jadi panjang diagonal yang lain adalah 14cm