I’m in AP Human Geography, and my textbook doesn’t have any of these definitions. If anyone can help define and give examples of any of these, I would be very grateful!!!

:calculate the sum of the interior angles of a 13-sided polygon.

Ray lo bisects nlm, lm=18, no=4, and ln=10. what is the value of x?

The us and canadian governments are doing all of the following to combat environmental problems except a. encouraging the use of public transportation b. enacting clean water policies c. requiring emissions testing d. limiting animal populations in some regions