### Home > CALC > Chapter 9 > Lesson 9.4.3 > Problem 9-139

9-139.

*r* = *a* + *b*sin(*θ*)

Notice that the points (2, 0) and (6, *π*/2) are on the graph.

Use these points and substitution to solve for the values of *a* and *b*.

9-139.

*r* = *a* + *b*sin(*θ*)

Notice that the points (2, 0) and (6, *π*/2) are on the graph.

Use these points and substitution to solve for the values of *a* and *b*.