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L = 1/2 x 48 x 36 = 864 cm^2
NB: ^ = pangkat
V = akar
d1=48 cm
⇔48:2=24
⇒phytagoras:√30²-24²= 18 cm
⇒luas: d1 x d2 : 2= 36x48:2 = 864 cm²
jadi, luas belah ketupat adalah 864 cm²