First you have to multiply 13 x 16 = 208. After that you have to find the area of the missing piece, to find that you have to add 5.7 + 6.2 = 11.9, and then subtract by 16 to get 4.1. Then you multiply 7.3 x 4.1 = 29.93.
29.93 is the area of the missing piece
So you would subtract the area of the whole thing (208) by the area of the piece (29.93)
