Relationship between the radius, diameter, circumference, and area of a circle.?

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Answer 1 · 2017-06-16T13:50:46

There are formulae you should learn for the circle:

The key number for a circle is the RADIUS.
The radius is the distance from the centre to any point on the circumference.

If you know this, then you can find all the other values.

#"radius"rarr xx 2 rarr "diameter" rarr xx pi = "circumference"#

#"radius" rarr "squared" rarr xx pi rarr = "area"#

There are formulae you should learn for the circle:

#2r = D hArr D = r/2#

#"Circumference: " C = pi D#

#"Circumference: "C = 2 pi r#

#"Area: " A= pi r^2#

#D = C/pi#

#r = C/(2pi)#

#r = sqrt(A/pi)#