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en.wikipedia.org/wiki/Circumference

The

www.emathzone.com/tutorials/geometry/relation-between-the-circumference-and-diameter.html

This constant ratio is denoted by Greek letter π . The value of π is 22/7or 3.1415.
∴

www.math-prof.com/Geom/Geom_Ch_31.asp

It is called the

www.mathgoodies.com/lessons/vol2/circumference.html

Pi is the ratio of the

www.math-only-math.com/relation-between-diameter-radius-and-circumference.html

www.ask.com/youtube?q=Relationship between Diameter Circumference&v=KDP8iVMDH8Q

Jun 7, 2015 ... This screencast shows how we can find the relationship between diameter and
circumference !

www.studyzone.org/mtestprep/math8/e/circumdiameter6l.cfm

www.pbslearningmedia.org/resource/ng09.math.geometry.pla.diameter/relationship-between-diameter-and-circumference/

Using two circles nearby, they compare the

www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-circumference-circle/a/radius-diameter-circumference

Learn the

illuminations.nctm.org/lesson.aspx?id=1849

Students measure the