GRE
x
y
A (a, b) + A (b, c)
A (a, c)
The radius of the circle
6
The number of diagonals of the octagon that are parallel to at least one side of the octagon
The number of diagonals of the octagon that are not parallel to any side of the octagon
a
b
The perimeter of the regular polygon
3 times the perimeter of triangle OAB
Length of AC
Length of BE
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