Mark is asked to prove that ∠4≅∠6, given that AB∥CD, as shown in the diagram above. Mark's proof is shown in the table below.

Which reason supports the statement Mark made in step 2 of his work?

A
Vertical angles are congruent.

B
Supplementary angles are congruent.

C
Corresponding angles formed by parallel lines are congruent.

D
Alternate interior angles formed by parallel lines are congruent.

D). Alternate Interior Angles formed by parallel lines are congruent.

Step-by-step explanation:

when rotating a figure 180 degrees, imagine that you are able to take the figure and turn it clockwise or counterclockwise around a center point. to rotate a figure 180 degrees, you will need to apply the rule (x, y) → (-x, -y). start by using a coordinate grid with coordinates for each vertex of the figure. the center point of the coordinate grid is located at (0, 0), which is what you will rotate the figure around. write down the original coordinates of the shape you are going to rotate. then, apply the rule. for example, coordinate (1, 2) becomes (-1, -2). another example would be, coordinate (-4, -2) becoming (4, 2). after you change each original coordinate to the rotated coordinate, you will draw your new figure.

step-by-step explanation: