How do you discribe what a place is like porvied two examples

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

What are two australian geographical features that hindered early exploration? western plateau gulf of carpentaria great barrier reef great dividing range