There are zero diagonals in a circle because a circle has no sides no vertices or it doesn't have a flat surface so zero.
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If you are referring to the segment passing through the center of the circle and touching the circumference of the circle then it's the diameter of the circle.There can be infinite diameters drawn inside a circle.
It has 1,345,890 diagonals
There are 20 diagonals
There are five diagonals in a pentagon.
5 diagonals