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.
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A straight line
hexagon and octagon.
A rhombus is one of them
A Rhombus is a flat shape with 4 equal straight sides. So the answer is that there are four interior angles.
You do not mention the number of sides or even if the sides are straight, but you are probably asking about a trapezium or trapezoid.