6533
[Commentary:
The reference on this page is to Petrus Ramus (Pierre de la Scholarum mathematicarum libri unus et triginta
(Ramus . (The same diagram appears in the 1599 edition, but there on page 314.) On pages 319–320 (the last two pages of the 1569 edition) Ramus states and proves what is usually known as Heron's Rule, for the area of a triangle given all three of its sides
(Ramus 1569, . Harriot's diagram is the same as that given by Ramus, but he translates Ramus's verbal proof into symbols.
See also Add MS f. , for the same problem and a similar diagram, there from Clavius, Geometria practica (Clavius . ]
See also Add MS f. , for the same problem and a similar diagram, there from Clavius, Geometria practica (Clavius . ]
scholæ mathematicæ Rami. pag.
[Translation: Scholarum mathematicorum of Ramus, page 320.
[Translation: Scholarum mathematicorum of Ramus, page 320.