Which factor is a primary cause of the change illustrated on these maps?

The blue segment below is a diameter of oo. what is the length of the radius of the circle?

If u make mistakes on a school trip to knotts like standing up on a ride too early and they ask you not to do it again or and if you do it again you will be escorted out will it go on my student record? yes i know it is a dumb question

Find the area of the shaded region.