# Chapter 1 - Tools of Geometry - 1-8 Perimeter, Circumference, and Area - Practice and Problem-Solving Exercises - Page 64: 11

$C=10\pi$ ft

#### Work Step by Step

The formula for circumference of a circle is $C=2\pi r$ The circle shown has a radius of $5$ ft. We plug this value into the formula and simplify: $$C=2π\times5=10π$$ The problem tells us to leave the answer in terms of $π$.

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