Rectangular → polar

Convert the point $\displaystyle x=6$, $\displaystyle y=4$. The drawing shows it: 6 across and 4 up, and the question marks are what we are looking for, $\displaystyle r$ and $\displaystyle \theta$. Press , type 6, press and , then type 4. Press and , the orange label above the 8 key: $\displaystyle r$ is 7.211102551. Press and to see $\displaystyle \theta$: 33.69006753 degrees. Press and again to return to $\displaystyle r$: 7.211102551.

▶ Watch this step in the video (46:03)