Use symmetry to graph r = 18 cos θ

 Use symmetry to graph r = -8cos θ

Use symmetry to graph r = 20 cos θ

Use symmetry to graph r = 6 sin θ

 Use symmetry to graph r = -18 sin θ

 Use symmetry to graph r = 18 sin θ

Use symmetry to graph  r = -4cos θ

Use symmetry to graph r = 6cos θ

 Use symmetry to graph r = -6cos θ

  Use symmetry to graph r = -6 sin θ