If each square of the grid below is 0.5 cm by 0.5 cm, how many square centimeters are in the area of the blue figure? (The perimeter is 21.)

Answer:
8.5
Step-by-step explanation:
There are 34 squares. Each square is 0.5 cm by 0.5 cm, so each square has an area of 0.25 cm^2.
0.25 x 34 = 8.5.