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sisinya dulu, yang dicari = keliling/4 sisi = 208/4 = 52
terus 96/2 = 48
cari diagonal yang satunya, pakai triple phytagoras = 52,48,20
berarti diagonal yang satunya = 20 x 2 = 40
luas = d1 x d2 : 2 = 96 x 40 : 2 = 1920 cm2
maaf kalau salah
sisi = 208 / 4
sisi = 52 cm
CO^2 = 52^2 - (96/2)^2
CO^2 = 2704 - (48)^2
CO^2 = 2704 - 2304
CO^2 = 400
CO = akar400
CO = 20 cm
diagonal2 = 2CO
= 2×20
= 40 cm
Luas
= 1/2 × d1 × d2
= 1/2 × 96 × 40
= 1.920 cm^2
Semoga bermanfaat :)