Sweet working with 45s because we only have one constant to work with 1.414
We also work with our understanding of right triangles where if we have a 90 and one 45, the other angle has to be 45 to add up to 180 degrees. That also means that the sides of the triangle are going to be the same. This means that in a piping arrangement offset and run(or rise) are the same.
Sometimes you have to puzzle things out a bit from the clues you are given and your knowledge of triangles.
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