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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 :
[tex]C=2\pi r[/tex]We know that the radius is half of diameter.
So the radius is 20/2 = 10 feet.
Using the formula above :
[tex]\begin{gathered} C=2\pi(10) \\ C=62.83 \end{gathered}[/tex]