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BOOK I. PROP. II. PROB.
ROM a given point (
), to draw a straight line equal to a given finite straight line (
).
Draw 
(post. 1.), describe 
(pr. 1.), produce 
(post. 2.), describe 
(post. 3.), and 
(post. 3.); produce 
(post. 2.), then 
is the line required.
For 
= 
(def. 15.), and = (const.), ∴ 
= (ax. 3.), but (def. 15.) = = :
∴ drawn from the given point (), is equal the given line .
Q.E.D.
