Source — Euclid's Elements, encoded as an rrxiv paper

VI.28 Proposition VI.28

To a given straight line to apply a parallelogram equal to a given rectilineal figure and deficient by a parallelogrammic figure similar to a given one; thus the given rectilineal figure must not be greater than the parallelogram described on the half of the straight line and similar to the defect.

lines 74–74 in main.tex