Pre-Calc: Unit 6 Polar Coordinates

1. Rectangular (x, y) to Polar (r, θ)

r² =

r² = x² + y²

^{(do this first)}

2. Rectangular (x, y) to Polar (r, θ)

tanθ =

tanθ = y/x

(then find θ with unit circle or calculator)

1. Polar (r, θ) to Rectangular (x, y)

cosθ =

cosθ = x/r

2. Polar (r, θ) to Rectangular (x, y)