PLS HELP ME!! What is the difference between a rotation and a reflection?

What does it mean for two figures to be congruent?

Travis performs a dilation of ⅓ on a polygon. He then classifies the image and pre-image as being congruent. Is Travis correct? Why or why not?

What does it mean for angles to be adjacent?

If angle X has a measure of 40 degrees and angle Y is vertical to angle X, what is the measure of angle Y?

Triangle ABC has two known angles. Angle A measures 55 degrees. Angle B measures 30 degrees. What is the measure of angle C?