
Finding the area of this type of shape is even trickier than what you saw in
the previous lesson.
As before there are two general approaches to
finding the area. In each case you must figure out the area of
rectangular areas and then you either add or subtract these areas depending
on which method you use.


Method One: full_width * full_height  middle_height * middle_width
In this case you multiply the full width by the full height and then
subtract away the product of the missing rectangle in the middle. Using the example we have:
19 * 41  10 * 16 = 619 square cm


Method Two: full_height * width_1 + width_2 * height_2 + full_height * width_3
In this case the shape is divided into three vertical rectangles. The area
of each rectangle is calculated and then these areas are added together.
19 * 9 + 9 * 16 + 19 * 16 = 619 square cm
Obviously, either method we use will yield the same answer.


Alternatively, method two allows you to split the shape into horizontal
rectangles like so:
10 * 9 + 9 * 41 + 16 * 10 = 619 square cm
