McGraw Hill Glencoe Geometry, 2012
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McGraw Hill Glencoe Geometry, 2012 View details
Practice Test
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Exercise 2 Page 771

Before we can find the circumference of the circle, notice that its diameter is equal to the length of the circumscribed polygon, which is a square.

Knowing that the diameter is we can substitute it in the formula for the circumference of a circle and simplify.
The circumference of the circle is units or about units.