 In this video, we provide the solution to question number seven for the practice exam number one for math 1060. We are given a diagram for which we see that these two lines are parallel lines and there's a third line that transverses them. So this looks like the diagram we often see with association to the alternate here angle theorem. We are supposed to find an angle that's not congruent to angle one. So angle one is this one right here. Well, angle three is congruent to it because they're vertical angles. So we can take that off the list. We get that one and seven are congruent because those are alternate interior angles. Take that off the list. We also get five is congruent to seven because they're vertical angles. And so by transitivity, one and five are congruent to each other. Other corresponding angles. So take that one off the list and clearly angle one is congruent to itself. So we now have it down to either angle six or F which is none of the above. When you look at angle six right here, that would be this friend right here. There's no guarantee that angle six would be congruent to angle one. Angle six would be supplementary to angle one but only if we have a right angle would those be the case. So it's not necessarily true that six is congruent to D. Therefore, excuse me, it's not necessarily true that angle one would be congruent to angle six. So therefore angle six, which is choice D would be the correct answer.