104 



GARDEN DESIGN 



*"*> DIAGRAM 30. 



triangle and reckoned all in one, which is quicker 

 than taking five parts separately. Let A B C D E 

 (Diagram 31) represent a five-sided field. Draw 

 B E, and from A draw F parallel to B E. Draw 

 B D, and from C draw C G parallel to B D. 

 B F G is a triangle equal in area to A B C D E, 



whose area can 

 be found in the 

 usual manner. 

 This method is 



^ also applicable 



to a four-sided 

 figure. 



As there are several ways of dividing any irre- 

 gular figure a safe method is to work the area 

 twice on different divisions. 



Areas with a curved irregular boundary on one 

 side, such as occur when offsets are used, can be 

 reckoned by connecting the two ends of the curve 

 by a straight line so that as much area is on one 

 side as on the other. A piece of cotton, or a cellu- 

 loid ruler, should be used to set the line, as it is 



DIAGRAM 31. 



