I 20 Jnflrumental Injlr unions 



Prpduft is 16665CCO ^ cf which Sum extract 

 the Root, which is 40 Chains 8:3 Links,which 

 fet off from A to E. Laftly, From E draw a 

 Line parailel to B C, as in the Lines E F, 

 which divides the Triangle, as demanded. 



Of dividin^gfour-Jided Figures^ or Trapeziia. 



Before I begin to teach you how to divide 

 Pieces of Land of four Sides, it is convenient 

 firft to (hew you how to change any four-fided 

 Figure into a Triangle 5 which done, the Work 

 will be the fame as in dividing Triangles. 



Jiow to reduce a Trapez^htfti into a Triangle^ 

 by Lines drawn from any Angle thereof. 



Let A B C D (Fig. 4 of the next Plate) be 

 the Trapezium to be reducM into a Triangle, 

 and B the Angle affign'd 5 draw the dark Line 

 B D5 and from G make a Line parallel there- 

 to, as C E ; extend alfo the Bafe A D, 'til 

 it meet CE in E^ then draw thfe Line BE, 

 which (hall make the Triangle ABE equal to 

 the Trapezium A B C D. 



Now, to divide this Trapezium according to 

 any aflign'd Proportion, is no more but to di- 

 vide the Triangle K B E, as before tanght 3 

 which win alfo dividt^ the Trapezium. 



Exafftpk. 



