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luas belah ketupat adalah diagonal 1 kali diagonal 2.
6*6=36
3x-2x = 4
x = 4
⇒ diagonal 1 =3x =3 x 4 = 12
diagonal 2 =2x = 2 x 4 = 8
⇔ L belah ketupat = 1/2 x d1 x d2
= 1/2 x 12 x 8
= 1/2 x 108
= 54
jadi luas belah ketupat tersebut adalah 54 cm²