Name a plane parallel to QRZ

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

Which of these tools or constructions is used to inscribe a hexagon inside a circle?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.