Tanya has a garden with a trench around it. The garden is a rectangle with length 2
1
2
m
2
2
1

m2, start fraction, 1, divided by, 2, end fraction, start text, m, end text and width
2
m
2 m2, start text, space, m, end text. The trench and garden together make a rectangle with length
3
1
2
m
3
2
1

m3, start fraction, 1, divided by, 2, end fraction, start text, m, end text and width
3
m
3 m3, start text, space, m, end text.
Find the area of just the trench.