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2) Caranya :
Luas = 1/2 x D1 x D2
80 = 1/2 x 16 x D2
80 = 8 x D2
D2 = 80/8 = 10 cm
= 1/2 x 10 x 12
= 60cm²
Luas kertas = 60cm²
2. L = 1/2 x d1 x d2
80 = 1/2 x 16 x d2
80 = 8 x d2
d2 = 80/8
d2 = 10cm
Panjang diagonal lain = 10cm