apa ya jawaban nomor 60?

y : x = 5 : 6 => y = 5/6 x
Keliling = 2x+x+y+y
56 = 3x + 2y
56 = 3x + 2(5/6 x)
56 = 3x + 1⅔x
4⅔ x = 56
x = 56 : 4⅔ = 12 => y = 5/6 × 12 = 10
Tinggi trap = √{(y²-(½x)²} = √(10²-6²) = 8
Luas trap = ½ × (12+24) × 8 = 144 cm² (B)