H
E
E
L
E
M
E
N
T
S
BH is equal to BK, DL, EH.
Now
BH is the rectangle A, BC, for it is contained by GB, BC, and BG is equal to A;
BK is the rectangle A, BD, for it is contained by GB, BD, and BG is equal to A;
and
DL is the rectangle A, DE, for DK, that is BG [I.34], is equal to A.
Similarly also
EH is the rectangle A, EC.
