If you double the radius of a circle will the circumference also double?

since the equation to get circumference is diamiter X pi, and the diamiter is 2x the radius, yes it would double the C of the circle

ie

before

radius is 2, so diamiter is 4

4 X Pi 12.57...

radius is 4 so the diamiter is 8

8 X pi = 25.13...

that would double it.