A shape having three right angles would be a square or a rectangle.
What is a rectangle?
A rectangle is a quadrilateral having the four sides and the sum of the angles is 180 in the rectangle the opposite two sides are equal and parallel and the two sides are at 90-degree angles.
Square:- A square is a quadrilateral having the four sides and the sum of the angles is 180 in the square all four sides are equal and parallel and all angles are at 90-degree.
Therefore the shape having three right angles would be a square or a rectangle.
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