140 Mr WALLACE, ON GEOMETRICAL THEOREMS, &c. 



Let US assume log «' = 2-0000000, 



then log V = 20628795, 



log c' = 20811931. 



With these logarithms, proceeding exactly as in the calculation Art. 23, 

 we find x = l, and hence, as in Art. 21, 2/ = 9, as=10. 



We might find x otherwise from formula vii. Art. 18, which may 

 stand thus: 



(b)+b-c^[e) = {x)' 



and it is a remarkable property of this expression that it is exactly 

 similar to the equation 



7/" + i/% + z' = a', 



where r> - and - take the places of y, x, and a. 

 be X 



