Plz help me I will give you 40 points and

The circumference of a circle is 60 pi cm3what is the radius of the circle

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis. how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

For how answer my question this will be the last question can you answer in math subject