stretching
Rotation is congruent.
congruence transformation
It would be left unchanged.
All right angles are the same
The size of the shape changes with a similarity transformation (enlargement), whereas it does not with a congruence transformation.
Reflecting
A congruence transformation of a shape is one that does not alter the size (area) or the relative lengths and positions of the lines.Translations, rotations and reflections are all example of simple transformations which are congruent.
stretching
yes
This sentence can be complete as: After a congruence transformation the area of a triangle would be the same as it was before.
Rotation is congruent.
unchanged
In math, a congruence transformation known as a rotation.
congruence transformation
It would be left unchanged.
Yes, it is.