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208 = 4s
208/4 = s
52 = s
L = (diagonal 1 x diagonal 2)
=
sisi = 208÷4=52
panjang salahsatu diagonal = 96
diagonal dibagi dua = 48
(lihat gambar)
terus pake phytagoras
(misalnya titik tengah = E)
BE = √(52²-48²)
BE = √2704-2304
BE= √400
BE = 20
BD= 2×BE
BD= 2×20=40
luas belah ketupat = ×d1×d2
= ×96×40
=1920cm²