Re: Let one dimension follows another dimension

You could do this with sketch relations if you wanted. Draw a
centerline through the middle of the shape and divide it into three
segments. Constrain the three segments collinear and equal length, and
they can be used to divide into thirds.

Another more generic semi-graphical method would be to have a
construction line the same length as "A" and sharing one endpoint with
"A", at an angle where the cosine B/A. A line perpendicular to "A"
starting at the other end of the construction line will divide "A" by
the fraction B/A.

You could also use similar (same angles, different size legs) triangles.

.

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