Two
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The answer is zero because it has no flat sides
An isosceles triangle has no parallel sides but it does have 2 sides of equal lengths
cylinder
A circle has four different ideas to sides. -Inside and Outside (two) -No sides (zero) -Disk idea, top and bottom (two)
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.