# Differentiation of Polar Equations**

• In mathematics, the polar coordinate system is a two-dimensional coordinate system in which each point on a plane is determined by:
• a distance from a reference point
• an angle from a reference direction.
• The reference point is called the pole, and the ray from the pole in the reference direction is the polar axis.
• The radial coordinate is often denoted by r, and the angular coordinate by θ.
• Angles in polar notation are generally expressed in either degrees or radians.
• For this course, we will always be in radians.
• The initial motivation for the introduction of the polar system was the study of circular and orbital motion.
• Polar coordinates are most appropriate in any context where the phenomenon being considered is inherently tied to direction and length from a center point.
• Many physical systems—such as those concerned with bodies moving around a central point or with phenomena originating from a central point—are simpler and more intuitive to model using polar coordinates.