Pitch angles are the slopes and the inclinations angles in the roofs. This angles has a specific way of calculation. Firstly, it can be found in both small family houses, or big residential buildings. It you want to make some renovations of your roof, it is essential to know this angle. The pitched roof has to have a gradient greater than 15 degrees or a slope bigger than 3.2 in 12. Importantly, the angles depend on the climate in the area and whether the climate is dry or cold, rainy and snowy.
Pitch Angles of the Roofs
See the precise steps for the calculation in the link below.