This is an improper polygon. To find the area of this figure we will find the area of the three rectangles inside of the figure. Lets do it:-
Rectangle #1:-
This rectangle is on the left side of the picture. Its from the bottom of the figure to the top.
l = 15m
w = 3m
We will use the following formula for all of the rectangles:-
A = wl
A = 3 · 15
A = 45
Rectangle #1:- A = 45m.
Rectangle #2 is the same as rectangle #1 cause it is the same size with the same dimension and it s located all the way to the right of the picture.
Rectangle #2:- A = 45m
Rectangle #3:-
This rectangle is all the way at the top of the pic. It is in between of the other 2 rectangles. To find the length and width of this rectangle we need to use the info on the other sides.
15m - 9m = l
15m - 9m = 6m
l = 6m
12m - 3m - 3m = w
12m - 3m - 3m = 6m
w = 6m
A = wl
A = 6 · 6 = 36
A = 36m
Rectangle #1:- 45m
Rectangle #2:- 45m
Rectangle #3:- 36m
Now we will add all the separate rectangles areas and the answer will be the area of the figure.
45 + 45 + 36 = 126
Area of the WHOLE figure = 126m
Hope I helped ya!! xD