Tolong dijawab pakai cara ya ! Besok dikumpul !

keliling = 144
= (2(3x-1)) +(2(4x-4)) = 144
6x-2 + 8x-8 = 144
14x-10 = 144
14x = 144+10
14x = 154
x= 11

lalu cari pakai rumus pitagoras
KM^2 = (4x-4)^2 - (3x-1)^2
KM^2 = 40^2 - 32^2
KM^2 = 1600 - 1024
KM = √576 = 24 cm (B)

semoga membantu ^^