Dividing a circle into areas "F" can also be derived, which will solve the problem. Its vertices include the "n" points on the circle, referred to as the exterior vertices, as well as the interior vertices, the intersections of distinct chords in the interior of the circle. The "generic intersection" assumption made above guarantees that each interior vertex is the intersection of no more than two chords. Thus the main task in determining "V" is finding the number of interior vertices. As a consequence of the lemma, any two intersecting chords will uniquely determine an interior vertex. These chords are in turn uniquely determined by
Mohr's circle stress formula_95 is the abscissa of the centre formula_85, given by and the length of the radius formula_98 of the circle (based on the equation of a circle passing through two points), is given by The maximum and minimum shear stresses correspond to the ordinates of the highest and lowest points on the circle, respectively. These points are located at the intersection of the circle with the vertical line passing through the center of the circle, formula_85. Thus, the magnitude of the maximum and minimum shear stresses are equal to the value of the circle's radius formula_98 As mentioned before,