Let us do one side at a time. Since the bases/sides are equal, we will start with that.
From here, we will apply the formula b(h)/2. Since the sides are equal, we do not need to divide by 2. So, that equals 24(10).
Doing the rectangles gives us 24(11) for the larger one, and 10(11) for the smaller one.
The top rectangle will give us 26(11).
From here, all you need to do is 24(10)+24(11)+10(11)+26(11). I bet you could do it from here!