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Jajargenjang jika dipotong berdasarkan diagonal akan memiliki luas yang sama.
Sehingga, dibelah dua jadi 2 segitiga.
Maka,
Berdasarkan Rumus Heron:
a = 6, b = 10, c = 14
s = 1/2(a+b+c)
s = 1/2(6+10+14) = 1/2 (30) = 15
Maka,
Maka, luas jajargenjang: