If a pair of perpendicular lines are rotated, which is true?

A) Rotating perpendicular lines result in parallel lines.

Eliminate

B) The lines remain perpendicular only if rotated 180°.

C) The lines remain perpendicular only if rotated 360°.

D) Rotated perpendicular lines always remain perpendicular lines.

The correct answer is:

D) Rotated perpendicular lines always remain perpendicular lines.

Explanation:

Perpendicular lines, by definition, meet at a 90° angle.

As long as both lines are rotated the same direction and the same angle, then the angle between the two lines will not change. They will continue to be perpendicular, no matter how many degrees or which direction they are rotated.

Rotated perpendicular lines always remain perpendicular lines.