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Unit circle - Wikipedia
https://en.wikipedia.org/wiki/Unit_circle
Since C = 2πr, the circumference of a unit circle is 2π. In mathematics, a unit circle is a circle with a radius of one.
What is the circumference of a unit circle? | Socratic
https://socratic.org › Trigonometry › Right Triangles › Measuring Rotation
Jul 13, 2015 - π can be defined as the ratio of the circumference of a circle to its diameter, hence the circumference of the unit circle is 2π . In general the circumference of a circle of radius r is 2πr . The area of the unit circle is π (in general πr2 where r is the radius).Circumference of a Circle - Math Goodies
www.mathgoodies.com/lessons/vol2/circumference.html
Circumference of a circle is presented in this interactive lesson from Math ... Unit 2 > Lesson 2 of 6 ... is the ratio of the circumference of a circle to the diameter.
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