It can, but does not have to.
No. For a start, a circle has no angles. No regular polygon has a reflex angle.
A reflex angle
An arrowhead
A rhombus
parallelogram!
In plane geometry, a shape with four sides, two of which are parallel and have the same length, cannot have a reflex angle.
cheesse
They are congruent angles if they have the same shape and size.
A rectangle is not an angle at all. It's a flat shape that looks like a box. A rectangle can never have a reflex angle inside it. But it always has four of them on the outside.
Answer Reflex Angle
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reflex angle