intersecting, parallel, acute, right ,obtuse, straight, perpendicular, reflex
Chat with our AI personalities
When all the dimensions and angles are identical.
In geometry, a regular object has all sides and all angles equal.
Presuming our geometry is Euclidean, such a shape would be a rectangle, since all 4 angles would be right angles. If our geometry is hyperbolic, it would be possible to construct such a quadrilateral which is not a rectangle (and in fact, rectangles cannot exist in a hyperbolic geometry). I do not believe such a quadrilateral has any special name.
All three interior angles of a spherical triangle may be right angles.
The branch of mathematics dealing with angles is geometry, there aren't angles in arithmetic.