Question

What is the area for all of them

Answer 1

The first one is around 15 square units 
The middle is around 9 square units 
The last one is around 8.5 square units 
Remember each full square is 1 and each half square or triangle is 0.5
So for the first one there's 2 on top and 1+1=2, then you go down to the next strip and you have 4 squares, so (1+1+1+1=4) then you go to the nex tstrip and add them all together so you get, 2+4+3+3+3=15.
The next one is the same thing, but if its not a square its 0.5
so you have 2 squares and a half (1+1+0.5) and so on until you get (1+1+0.5+0.5+0.5+1+0.5+0.5+0.5+1+1=                                   )
The last one is just the same

Answer 2

What are the units for each