In the diagram at right, the point P has Cartesian coordinates (x, y) and polar coordinates (r, θ). Homework Help ✎
Explain why x = r cosθ.
Find y in terms of r and θ.
Find r in terms of x and y.
Find θ in terms of x and y.
Using the diagram, cos(θ) = x/r.
Using the diagram, sin(θ) = ?
What theorem can be used to relate the three sides of a right triangle?