How to Express Region D in Polar Coordinates?

[Swapnil]

How would you write the region D given by

<br /> \[D: \left\{ <br /> \begin{array}{l l}<br /> \frac{-d}{2} \leq y \leq \frac{d}{2} \\<br /> -\infty &lt; x &lt; \infty \\ \end{array} \right. \]<br />

in polar coordinates?

 

[mjsd]

first think about how you write the equation of a straight line in polar coord...

 

[HallsofIvy]

Or, more specifically, how to write x and y in polar coordinates. Replace x and y in the inequalities with those and solve the inequalities.