|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,
MK, KD are less than ML, LD; [I.21]
MK is equal to ML;
the remainder DK is less than the remainder DL.
Similarly we can prove that
DL is also less than DH.
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