A triangle, pentigone, hexigon, octogon .....
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If the question is about a plane shape with exactly 3 right angles it could be an irregular polygon of 5 or more sides. If the shape can have more than 3 right angles then a square or rectangle are also possible. Finally, in 3 or more dimensions, a polyhedron with any number of faces can have 3 or more right angles.
A triangle. To be more specific, an equilateral triangle.
Squares and rectangles always have, but anyshapewith more than 3 sides can have 2 right angles.
Triangle
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