I think the answer is c.
Hope this helped!
-9+x ?
I don’t know if this is the right answer
Radian measure is given by dividing the length of an arc by the radius of a given circle. Such that an arc that subtends an angle of 1 radian to the center of a circle is equivalent to the radius of the circle.
Therefore; θ = s/r where θ is the angle subtended in radians, s is the length of the arc and r is the radius of the circle.
Hence; r = s/θ
= 12π ÷ (4π/7)
= 12 × (7/4)
= 21 inches
Okay so

.
First, we make 16 a fraction:

Then, we make

a improper fraction:

Now, we multiply

by

:

Finally, we simplify

:

.
Your answer is

.
Hoped I helped. :)