The central angle of the hexagon is equal to 60º.
Therefore, the trigonometric relationship for the radius is given by:

Where,
a: apothema of the hexagon
c: Hexagon radius.
Clearing the radio we have:

Substituting values:

Rounding to the nearest whole number we have:

Answer:
The measure of the radius, c, rounded to the nearest inch is:
C. 14 in.
A Point is needed to define a circle
Hope this helps!!!