Final answer:
If two lines intersect and one of the angles formed is a right angle, then the other angle formed is also a right angle.
Step-by-step explanation:
If two lines intersect and one of the angles formed is a right angle, then the other angle formed is also a right angle. This is because when two lines intersect, they form vertical angles, which are congruent. Vertical angles are opposite angles formed by the intersection of two lines and have the same measure. If one of the angles formed is a right angle, which measures 90 degrees, then the corresponding vertical angle will also measure 90 degrees, making it a right angle as well.