Vertical angels
No. The diagonals are perpendicular, but they dont have to be congruent.
No. In fact they are almost NEVER congruent.
Yes.
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.
A rhombus
Two angles are congruent if they have the same measure.
That is called a regular polygon.
A square:) :) :)
Neither. It forms 4 congruent angles and, as far as I am aware, no angels.
Usually not.
square
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