BOOK V. I. 13-11. 3 



specimens of every kind of shape which we will use as 

 patterns. 



II. Every piece of land is square, or long, or wedge- The shapes 

 shaped, or triangular, or round, or else presents the the'rrm-'*"'^ 

 form of a semi-circle or of the arc of a circle, some- mensions. 

 times also of a polygon. The measuring of a square 

 is very easy ; for, since it has the same number of feet 

 on every one of its sides, two sides are multiplied 

 together and the product of this multiplication we 

 shall say is the number of square feet. For example 



100 feet 



100 feet 



10,000 

 square feet 



100 feet 



100 feet 



if an area were 100 feet each way, we multiply 100 by 

 100 and the result is 10,000. We shall, therefore, say 

 that the area contains 10,000 square feet, which 

 make a iriens {\) plus a sextula (^) of a iugenim,^ and 

 on the basis of this fraction we shall have to calculate 

 the amount of work done. 



If it is longer than it is broad (for example let the 

 form of the iugerum have 240 feet of length and 120 of 

 breadth), as I said just now, you will multiply the feet 

 of the breadth with the feet of the length in the 

 following manner : 120 times 240 make 28,800, and we 

 shall say that the iugerum of land contains this number 



13 



