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40=4×s
s=40÷4
s=10
d2=10 kuadrat- 8 kuadrat
d2=100-64
d2= akar dari 36
d2=6
d2=6×2=12
L.belah ketupat= 1/2×d1xd2
L=1/2×16×12
L=96 cm2