... MAGNITUDE In order to treat angular magnitude numerically it is necessary to use some fixed angle as a standard of comparison, by reference to which the magnitudes of angles under consideration ... Bc = Ba = s − b, Ca = Cb = s − c Def Let two of the sides of the triangle ABC be produced, and a circle described touching the two produced sides and the third side OF THE AREA OF A TRIANGLE ... usually understood CHAPTER I OF THE MENSURATION OF THE CIRCLE Def A magnitude or ratio, which is fixed in value by the conditions of the question, is called a Constant Def A magnitude or ratio,...