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BOOK I. PROP. XLV. PROB.
O conſtruƈt a parallelogram equal to a given reƈtilinear figure () and having an angle equal to a given reƈtilinear angle ()
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Draw the rectilinear figure into triangles.
cone MJ = J | having hg = 0 (pr. 42.) as = VJ having 4-0 (pr. 44.) >. .2 0K having 4M = = a7 (pr. 44-)
_-4
= MY is a parallelogram. (prs. 29, 14, 30.)
having | = | .
and mw—_—_—_— ddiidng
Q. E. D.
