How much fall in 3 degree' roof over 1.8 metres?

To calculate the fall of a roof with a 3-degree pitch over a distance of 1.8 meters, you can use the formula for rise, which is ( \text{rise} = \text{run} \times \tan(\text{angle}) ). First, calculate ( \tan(3^\circ) ) which is approximately 0.0524. Therefore, the rise over 1.8 meters is ( 1.8 \times 0.0524 ), resulting in a fall of approximately 0.0943 meters, or about 9.43 centimeters.