# Polar Equation of a Conic

Some important results and formulas regarding the polar equation of a conic are listed here.

1. The polar equation of a conic is

• If $e < 1$ the conic is an ellipse.
• If $e > 1$ the conic is a hyperbola.
• If $e = 1$ the conic is a parabola.

2. The angle between two curves is given by

3. Two curves are perpendicular to each other if