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Book III   Proposition 8
And, since on MD, one of the sides of the triangle MLD, two straight lines MK, KD were constructed meeting within the triangle,
therefore
    MK, KD are less than ML, LD; [I.21]
and
    MK is equal to ML;
therefore
    the remainder DK is less than the remainder DL.

Similarly we can prove that
    DL is also less than DH.
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