They are all types of transformations.
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Because congruent figures just rotate or reflect making the shape the same size same everything, but when you dilate you shrink it or enlrge it making a similar figure but not a congruent figure. but translations, reflections, rotations, and dilations common thing is that when you move it or shrink it your shape still has the same angles.
Angles that have a common side between them and a common vertex are called adjacent angles.
They pass through the centre of the circle and are the circle's diameter
draw two angles in three common points
adjacent planes