# 21.5 Logarithmic spirals

Before you read this, I suggest you read post 21.3. In post 21.3 we met the simple spiral whose equation in polar coordinates is r = aθ (1) where a is a constant, r is the radius of the spiral and θ is an angle that is positive for anticlockwise rotation. In this post we… Continue reading 21.5 Logarithmic spirals