BOOK V. II. 5-6 



30,000. Likewise take a tenth part, that is 9,000. 

 Add the two numbers together ; the result is 

 39,000. We shall say that this is the total number of 

 square feet in this triangle, which measure makes a 

 iugerum, plus a triens (^), plus a sicilicus (4^)." 



But if your field is triangular with unequal sides, as 

 in the figure given below, which has a right angle, 

 the calculation will be ordered differently. Let the 

 line on one side of the right angle be 50 feet long and 

 that on the other side 100 feet. Multiply these two 

 numbers together; 50 times 100 makes 5000; half 

 of this is 2500, which makes an uncia {j^ of a iugerum) 

 -{- a scripubtm (jsg).^ 



50 feet 



100 feet 



If the field is to be round, so as to have the appear- 

 ance of a circle, reckon the number of feet as 

 follows. Let there be a circular area of which the 



17 



