Answer:
Well, I'm not sure what you mean but Ptolemy's Theorem gives a relationship between the side lengths and the diagonals of a cyclic quadrilateral; it is the equality case of Ptolemy's Inequality. Ptolemy's Theorem frequently shows up as an intermediate step in problems involving inscribed figures.
8/6 = 14/x
8x = 84
x = 10.5
The length of GD = 10.5
** I think that is right not positive
C
First you -4 from x so you have to do the opposite which is to add 4
11.25 inches. Divide 1800 by 160 and get your answer