A,3x,b,5x,c,4x Bila keliling segitiga Abc=60cm hitunglah luas segitiga abc

K = jmlh smua sisi
60 = 3x + 5x + 4x
60 = 12x
x = 60/12 = 5

sisi miring segitiga = sisi yg paling panjang (5x)
L = a × t × 1/2
L = (3•5) (4•5) × 1/2
L = 15 × 20 × 1/2
L = 15 × 10 = 150 cm²