Answer this problem for a lot of points. check the image.

First, we take the squares in the right and left bottom. They're equal in the length of 5m so the region of each one of them is:

now we take the rectangular above, it has a length of 28m and a width of (9-5=4m) so its region is:

Now the region of the shaded area is region of both of the squares and the rectangular which is:

So the region of the shaded area is 162m^2

Because 3/6 is equal to 1/2 (one half).