Vertical angels
No. The diagonals are perpendicular, but they dont have to be congruent.
Yes.
No. In fact they are almost NEVER congruent.
Rectangles do not have congruent lines. A square can always be called a rectangle. But a rectangle can't always be a square.
An obtuse triangle does not always have three congruent sides. An obtuse triangle can be any form that always has three angles.
There is no specific name for them.
Two angles are congruent if they have the same measure.
A rhombus
That is called a regular polygon.
Usually not.
square
A 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
Angles that are always congruent are applesauce angles
That is a mathematical impossibility. At least 2 angles have to be congruent in order for the shape to have 4 sides.