Pliiiisssss jawab pake caranya

R : s : t = 2 : 5 : 4
keliling segitiga = s+s+s
cara :
2x+5x+4x = 88
11x = 88
x = 8
garis RS = 2×8 = 16
garis ST = 5×8 = 40
garis RT = 4×8 = 32