If the circuference of a circle increases from 4pi to 8pi then the area is

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?

Each side length of the hexagons is 1, what’s the area of abc