Answer:
![\boxed {\boxed {\sf 48 \ meters }}](https://img.qammunity.org/2022/formulas/mathematics/college/fjkwhzn5rdq9thn0jozawegy7ixx7bmhy1.png)
Explanation:
The perimeter is the sum of the side lengths.
A rectangle has 4 sides: 2 lengths and 2 widths, so the perimeter formula is
![p= 2l+2w](https://img.qammunity.org/2022/formulas/mathematics/college/kq9ko65zscn0rqxsngk5of8yk07r3e54ce.png)
The length is 20 meters and the width is 4 meters.
![p= 2(20 \ m )+ 2(4 \ m )](https://img.qammunity.org/2022/formulas/mathematics/college/tl7sfssp56qgqmhcua63g5ygfi3upv5lmb.png)
Multiply.
![p= 40 \ m + 8 \ m](https://img.qammunity.org/2022/formulas/mathematics/college/b4sn5fpozvusabjhyhw8p5k7qm5xqxh0jr.png)
Add.
![p= 48 m](https://img.qammunity.org/2022/formulas/mathematics/college/ii62q5pgrchn1nfzobk797xijemvn8m440.png)
The perimeter of the rectangle is 48 meters.