What is the area of this figure?
Cut it into 3 triangles and a rectangle and add them together
triangle area = 1/2 b h
three triangles 1) 4 x 3 2) 4 x 3 3) 8 x 2
rectangle 3 x 8
Alternatively, you could use Picks theorem for this particular figure. See https://en.wikipedia.org/wiki/Pick%27s_theorem