Say we have listed the first few multiples of 4 and 5: the common multiples are those that are found in both lists: The multiples are those that are found in both lists: The multiples of 4 are: 4,8,12,16,20,24,28,32,36,40,44,.........The multiples of 5 are: 5,10,15,20,25,30,35,40,45,50,.... Hope this helped and if you need more help then just message me :)
If we discuss this as if it is a triangle then the "rise" is the vertical side and the "run" is the adjacent side. So the ratio of the rise to the run is 8 / 15 which equals
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0.5333333333
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To find the angle of this roof pitch we look up the arc tangent of
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0.5333333333
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and we find that is 28.072 Degrees