ANSWER :
62.83 feet
EXPLANATION :
The pie has a diameter of 20 feet.
The size of the crust covering is the circumference of the pie.
The circumference formula is :
![C=2\pi r](https://img.qammunity.org/2023/formulas/mathematics/high-school/noytl63lm1q06t23qsdkycir68uwxrmxzb.png)
We know that the radius is half of diameter.
So the radius is 20/2 = 10 feet.
Using the formula above :
![\begin{gathered} C=2\pi(10) \\ C=62.83 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/86s6gj61ohdf4klbw2uv9hkkpsbdgru1p6.png)