If each square is the equivalent of 1 cm...
1.
length = 12ft
width = 15ft
area = 180ft
2.
length = 12ft
width = 12ft
area = 144ft
3.
length = 12ft
width = 18ft
area = 216ft
4.
length = 9ft
width = 6ft
area = 54ft
5. 250 miles.
6. 600 miles.
7. 118.75 miles. ?
8. 40 miles.
9. 141.66 (142) miles.?
10. 162.5 miles.
I'm hoping this will help you. Please message me if my logic is flawed.