Page talk:Newton's Principia (1846).djvu/250
Following on from previous page, this should read:
a parabola, whose property is that a rectangle under its given latus rectum and the line IM [i.e the product of the latus rectum and IM] is equal to the square of HM.
Note: this latus rectum is for the point H and is 4 times the radius from the focus (not shown in the diagram on the previous page) to the point H.