Answer:
r=10.0
(10.0267614148)
Explanation:
So circumference=2πr
63=2πr
lets divide both sides by π
20.0535228296=2r
lets divide both sides by 2, you should have your answer
r=10.0267614148, but since we are rounding to the nearest tenth it should be r=10.0
hope i could help :)