T
H
E

E
L
E
M
E
N
T
S
Book VI   Proposition 30
Since
    GH is equal to EL, C,
while
    GH is equal to MN,
therefore
    MN is equal to EL, C.

Let
    EL be subtracted from each;
therefore
    the remainder, the gnomon XWV, is equal to C.
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