1. Calculate the area:

* Area = length x width

* Area = 5 m x 4 m

* Area = 20 m²

2. Calculate the pressure:

* Pressure = Force / Area

* Pressure = 450 N / 20 m²

* Pressure = 22.5 N/m²

Therefore, the pressure exerted is 22.5 N/m² (Newtons per square meter).