A Circle
if you mean 2d circle, 3d sphere =P Any continuously curves shape has no sides; ellipse (ellipsoid), cone, hyperbolic paraboloid...
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a shape with equal sides
A shape with four sides has four vertices and a shape with three sides has three vertices, so a shape with four sides has more vertices than a shape with three sides.
The Shape That Has 8 Sides Is A Octagon Which Has 8 Equal Sides
shape no pairs of perpendicular sides
it a shape the sides have names 5 sides = pent