ANSWER
EXPLANATION
The circumference of a circle is calculated using the formula:
![C=2\pi \: r](https://img.qammunity.org/2020/formulas/mathematics/middle-school/olf39earpyj652as6pox8py4w2as29pd3f.png)
From the question, the radius of the circle is 10 inches.
We substitute the radius into the formula to get:
![C=2\pi * 10](https://img.qammunity.org/2020/formulas/mathematics/high-school/dhilh3xc8cgkz9c8uonpd48amxn2fajhuk.png)
Let us multiply out to get:
![C=20 \pi \: in](https://img.qammunity.org/2020/formulas/mathematics/high-school/wbv5bypst33qalfnqk9sk42vtxxx8k14q0.png)
The question required that we leave the answer in terms of π.
The correct choice is C.