Two perpendicular lines intersect. What is the measure of each angle formed?

Two perpendicular lines intersect. What is the measure of each angle formed?

• A. 45 degrees
• B. 60 degrees
• C. 180 degrees
• D. 90 degrees

Answer: (D)

When two lines are perpendicular, they meet to form right angles. A right angle measures 90 degrees. At the intersection of perpendicular lines, four angles appear, and each one is a right angle, so every angle formed is 90 degrees. The other numbers don’t fit because 45 and 60 are acute angles, asking for smaller turns, while 180 degrees is a straight line, which would not create the cross shape seen with perpendicular lines.

When two lines are perpendicular, they meet to form right angles. A right angle measures 90 degrees. At the intersection of perpendicular lines, four angles appear, and each one is a right angle, so every angle formed is 90 degrees. The other numbers don’t fit because 45 and 60 are acute angles, asking for smaller turns, while 180 degrees is a straight line, which would not create the cross shape seen with perpendicular lines.