An equilateral triangle inscribed in a circle has a length of 20cm find the distance to the centre and the radius​

Turner's mom measured his room to see how long the wallpaper border needed to be. if two walls are 15 feet long and two walls are 12 feet long, how long should the strip of border be cut?

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning