Please help me find the circumference and area ​

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

Iwill make brain if you me correctly fill this out needs due today pls and send it back to me (click the link and you will get it)

Can someone me with these two circle theorem questions asap?