How many diagonals are there in a polygon of 6o sides

9 diagonals  

Bit by bit clarification:  

Number of Diagonals = n(n-3)/2  

For instance, in a hexagon, the complete sides are 6.

Along these lines, the complete diagonals will be 6(6-3)/2 = 9.

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8