Q1
————
16
π
Explanation:
To find the circumference of a circle, you need the radius.
Remember that the area of a circle is
A
=
π
r
2
Since we know the area, we can plug it in for
A
64
π
=
π
r
2
64
π
=
π
r
2
64
=
r
2
Take the square root of both sides to find the radius:
r
=
8
Now, use the circumference formula of
2
π
r
C
=
2
π
(
8
)
This simplifies to the circumference equalling
16
π
