In the figure shown, line intersects lines and . Which of the following statements must be true if lines and are parallel?
The angle in the top-left interior position is congruent to the angle in the top-right interior position.
The angle in the top-right exterior position and the angle in the bottom-left interior position are supplementary.
The angle in the top-left exterior position is congruent to the angle in the bottom-right interior position.
The angle in the top-right interior position and the angle in the bottom-left interior position are congruent.
