Answer:
126 meters squared
Step-by-step explanation:
first you need to add the sides so that it is one measurement of the big rectangle. The sides are 13 x 12. mutiply those together to get 156. That is the entire area of the whole rectangle. then you need to subtract out the unshaded regions. The middle one (c) is simple, 9 meters. The corner ones (a and b) are a bit tricker. It comes out to 10.5 meters each. Now subtract the unshaded regions in an equation that looks somewhat like this:
156-10.5-10.5-9= 126
