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Overview
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A circle is a two dimensional closed region where each point on its circumference is equal in distance from the centre. The equation for a circle is (x - x0)2 + (y - y0)2 = r2
See Also: Open Another, Using the Calculators
Formula
Required
Known
r
d
c
A
-
r = d / 2
r = c / pi / 2
r = ( A / pi )0.5
d = r * 2
d = c / pi
d = ( A / pi )0.5 * 2
c = r * 2 * pi
c = pi * d
c = ( A / pi )0.5 * 2 * pi
A = pi * r2
A = pi * ( d / 2 )2
A = pi * (( c / pi ) / 2 )2
r = Radius in linear units. d = Diameter in linear units. c = Circumference in linear units. A = Area in square units.
Calculator
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d []:
c []:
A []:
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A circle is a two dimensional closed region where each point on its circumference is equal
in distance from the centre.