Calculate the area of these following shapes

We are asked to find the area of a T-shaped region. We assume that all of the sides are perpendicular:

There are multiple approaches. One way is to cut the figure into two rectangles; the rectangle formed at the top of the "T" and the rectangle that forms the stem.

For the top rectangle the area is 8x20=160 square cm.

For the "stem", the length is 25cm. The width is 8cm. (We subtract the two 6cm lengths from the 20cm length to get 8cm.) So the area is 8x25=200 square cm.

The total area is 160 sq cm + 200 sq cm = 360 sq cm.