Find the circumference of the circle in terms of pi.

Option: D is the correct answer.

 The circumference of the circle in terms of pi is:

                 D.   78π in.

We know that for a circle with radius r the circumference of the circle is given by the formula :

Here in the given figure we have: Radius (r)= 39 in.

Hence, the circumference of the given circle is calculated as:

Hence, the circumference of circle is:

                     78π in.