## Quick Reference

(to a curve)

Suppose that *P* is a point on a curve in the plane. Then the normal at *P* is the line through *P* perpendicular to the tangent at *P*.

*Subjects:*
Mathematics.

Overview

(to a curve)

Suppose that *P* is a point on a curve in the plane. Then the normal at *P* is the line through *P* perpendicular to the tangent at *P*.

*Subjects:*
Mathematics.