9 * 4 = 36 sooo 36 / 4 = 9
so the answer is 36 .
i hope this helps.
70.6 what i got was 70.6753275399
The circumference is about 3.14 (

) times bigger than twice the radius. Mathematically, this can be writted as

, where C equals the circumference and r equals the radius, or

where C equals the circumference and d equals the radius.