ac=5x, cb=(9x+8), ba=12x, dan siku siku di sudut cab. jika luas segitiga abc =120cm maka keliling segitiga abc....

alas = ac = 5x
tinggi = ab = 12x
L = a × t / 2
120 = 5x × 12x / 2
120 = 30x²
x² = 120/30 = 4
x = √4 = 2
ac = 5(2) = 10
ab = 12(2) = 24
cb = 9(2) + 8 = 26
k = 10 + 24 + 26 = 60