When two lines are intersected by a transversal line then the non adjacent angles in the matching corners are known as pair of Corresponding Angles.
In the given figure angle 6 and angle 2 are the two non adjacent angles in the matching corners , which we called as a pair of Corresponding Angles. {By definition}
Therefore, angle 2 and angle are related by corresponding angles .
Given that the minute hand is at exactly 12hrs there is a difference of 5 hours in between so you multiply 5over 12 by 360degrees and you get 180degrees
