tolong dong kerjain no17 beserta cara nyaa trims

 luas persegi
72 cm = 4s
18 = s

18 - 2 = 16
18 + 2 = 20
20 -16 =4

(20 X 2) + (16 X 2)
40 + 32
72

l = 20 X 16
     320