Two angles are congruent if they have the same measure.
Vertical angels
There is no specific name for them.
A rhombus
That is called a regular polygon.
A square:) :) :)
Usually not.
square
Neither. It forms 4 congruent angles and, as far as I am aware, no angels.
are angels having not equal,zize shape and measurement
15
That is a mathematical impossibility. At least 2 angles have to be congruent in order for the shape to have 4 sides.
All 4 angles of a rectangle are congruent each measuring 90 degrees