A triangle.
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A scalene triangle.
A scalene triangle.
If there are no angles, all you have is a 'straight side'. There is a plane and no shape. Maybe you are thinking that straight means standing up straight. You might then be thinking of an upright tube.
a circle
A shape with at least one side that is not straight, a shape where a pair of straight lines cross one another (like an angular figure of 8).