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kalo benar..
Maka, pada segitiga BCE berlaku phytagoras:
CE = √BC²-BE²
CE = √13²-5²
CE = √169-25
CE = √144
CE = 12 cm
Sehingga,
Luas jajargenjang (ABCD)
Adalah:
= Alas x Tinggi
= AB x CE
= 7 x 12
= 84 cm²