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80 = 10 x d2 x 1/2
80 = 5 x d2
80 : 5 = d2
16 = d2
maka diagonal lain = d2 = 16 cm
Luas = 80 cm²
d1 = 10 cm
Dijawab :
L = 1/2 . d1 . d2
80 = 1/2 . 10 . d2
80 = 5 . d2
d2 = 80/5
d2 = 16 cm
Jadi, panjang diagonal yang satunya adalah 16 cm.