### Home > PC > Chapter 11 > Lesson 11.2.1 > Problem 11-73

11-73.

Set the equations equal to each other (because *r* = *r*).

Divide both sides by 2.

Apply the Double Angle Identity for sine.

Set the equation equal to 0 and factor.

Use the Zero Product Property to solve for *θ*.

Use your values for *θ* to solve for *r*.

Verify your answers and that you found all points of intersection by graphing.