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60/4 = 15cm
lalu cari diagonal lainnya pake pitagoras
tapi diagonal yg diketahui dibagi 2 dlu
jdi 18:2=9
akar dari 15kuadrat - 9kuadrat = akar dri 225-81 = 144 = 12
12.2= 24
luas belah ketupat = 1/2.d1.d2
=1/2.18.24 = 216cm^