By A Mystery Man Writer
To draw a normal line to the mirror, you must draw a line at 90 degrees to the surface of the mirror.
Right angle - Math Steps, Examples & Questions
Prove the following. \ If two lines meet to form a right angle
Normal Line to a Curve, Equation & Examples - Lesson
Measurement, Shape and Space - Mr. Grant's Class
Right Angled Triangle (Definition, Properties, Formulas)
A perpendicular line from another has a 90 degree angle
Tangent/normal to a curve - 90 degrees?? - Mathematics Stack Exchange
How to Construct a 90 Degrees Angle Using Compass and Ruler
Angle of Reflection Definition, Types & Formula - Lesson
What are some ways to draw lines at a 90 degree angle using rulers