I don’t think this is the case. Just the reverse.

1. Instead of representing the position of a point in a plane in terms of its horizontal and vertical distances along two standard lines of reference, it is sometimes more convenient to define the position of the point by length and direction. 2. The new parametric net is therefore the net whose equation in the old parameters u, v is written by setting the right member of this equation equal to zero. 3. Certain notions from analytic projective geometry are quite useful in interpreting some of the formulas of metric differential geometry. 4. In writing “the sine of the angle PON” in an equation or formula, it would be abbreviated sin PON. 5. By solving a triangle we mean that we have some of the sides and angles given and proceed to calculate the rest. 6. We found the solutions of this system of equations by eliminating unknowns, that is, by multiplying equations by scalars and then adding to produce equations in which some of the xy were not present. 7. Then we indicate that g is an element of G by writing g G. 8. The method of solving by successive eliminations may perhaps be known to the reader. 9. For the purpose of formulating a precise definition of the angle between two tangents at a point of a surface, a positive sense of rotation in the tangent plane of the surface at the point is assigned by this convention. 10. Our purpose in considering two separate problems is one of convenience. 11. The method of illustrating the variation of functions by the use of graphs is well-known to the reader. 12. The problem of subtracting a number from a smaller number is considered impossible in arithmetic.

Ex. 16. Translate into English.