McGraw Hill Glencoe Algebra 1, 2012
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McGraw Hill Glencoe Algebra 1, 2012 View details
6. Relations
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Exercise 53 Page 46

Do you remember the formula for calculating the circumference of a circle?

cm

Practice makes perfect
The perimeter of a circle is called the circumference. The circumference of a circle with radius is calculated using the formula below.
From the figure, we know that the radius of the circle is By substituting for in the formula, we can calculate
The circumference of the circle is approximately