- 39 The plane figures with which we are concerned come mainly under the description of
**graphs**of continuous variation. - In particular, the equality or inequality of values of two functions is more readily grasped by comparison of the lengths of the ordinates of the
**graphs**than by inspection of the relative positions of their bounding lines. - The second class of cases comprises equations involving two unknowns; here we have to deal with two
**graphs**, and the solution of the equation is the determination of their common ordinates. - [[Mensuration Of
**Graphs**38.]] (A) Preliminary. - (B) Mensuration of
**Graphs**of Algebraical Functions.

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