H
E
E
L
E
M
E
N
T
S
and
let AD have been joined.
On the straight line DA, and at the point A on it,
let the angle DAE have been constructed equal to the angle ADC; [I.23]
and
let the straight line AF have been produced in a straight line with EA.
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T H E E L E M E N T S |
Book I Proposition 31 | |
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Let the point D have been selected at random on BC, and let AD have been joined. On the straight line DA, and at the point A on it, let the angle DAE have been constructed equal to the angle ADC; [I.23] and let the straight line AF have been produced in a straight line with EA. |
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