(pake cara ya) :)


AC : 96 cm, AO : 1/2 AC = 1/2\xd7 96 = 48 cm, keliling = 208 cm, 4\xd7 AB = 208, AB = 52, BO =221a52\xb2 – 48\xb2, 221a2.704 – 2.304, 221a400 = 20, BD = 2\xd7 20 = 40, luas belah ketupat = 1/2\xd796\xd7 20 = 1920 cm\xb2
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Keliling = 208cm, sisi = 208/4 = 52cm, = , = 2704 – 2304, = 400, x = , x = 20cm, maka diagonal1 = 96 dan diagonal2 = 40, jadi, luas belah ketupat ABCD = diagonal1 X diagonal2 / 2 = 96 X 40/2 = 1920 ,