draw 
db a 
right 
C 358 3 
from the Angle d to the oppofite fide product 
right line dxy , and to make xy equal to a 
Line given w. 
\ 
db^ ab I : xy, 
xbz 3» dby or 
xbx are Similar 
dz^ ^z: : xz^ bz. 
xz, 
dxz. 
Let therefore be equal to m. 
by the id. of the 6th. Book of Euclid ab, dy : : dx, xy. 
Let the Angle dxz be = dby. 
and becaufethe Triangles ^xCj dby are Similar, 
db^ by: : dx, 
Therefore by Equality 
But the Angle 
Therefore the Triangles ^x^, 
Therefore 
Conjlrulfion and Btmof^firntion. . 
Let db be to ab-^ as m tog, and let dz^ bz whofe diife- 
fence is db be found reciprocal to g. Set off from the 
point z the Line zx equal to |^,and,through x draw dxy^ I 
fay that xy is equal to the given line m. 
"For fince by the Conftrudliony^ is to^ PgXob^y that 
is dz istojc^i as to bz':^ The Triangles dzx ^ bzx 
will 
