T
H
E

E
L
E
M
E
N
T
S
Book VI   Proposition 28
And, since
    PR is equal to OS,
let
    QB be added to each;
therefore
    the whole PB is equal to the whole OB.

But
    OB is equal to TE, since the side AE is also equal to the side EB; [I.36]
therefore
    TE is also equal to PB.
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