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78 = 2 x (p + l)
p + l = 78/2 = 39 cm
Dengan menjumlahkan perbandingannya (8+5=13) maka:
p = 8/13 x 39 = 24
l = 5/13 x 39 = 15 cm
Luas = p x l = 24 x 15 = 360 cm²