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From Nordan Symposia
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* The [http://en.wikipedia.org/wiki/Circumference circumference] of a [[circle]] is proportional to its [http://en.wikipedia.org/wiki/Diameter diameter], with the constant of proportionality equal to π.
* The [http://en.wikipedia.org/wiki/Circumference circumference] of a [[circle]] is proportional to its [http://en.wikipedia.org/wiki/Diameter diameter], with the constant of proportionality equal to π.
* On a map drawn to [[scale]], the distance between any two points on the map is proportional to the distance between the two locations that the points represent, with the constant of proportionality being the scale of the map.
* On a map drawn to [http://en.wikipedia.org/wiki/Scale scale], the distance between any two points on the map is proportional to the distance between the two locations that the points represent, with the constant of proportionality being the scale of the map.
* The [[force]] acting on a certain object due to [[gravity]] is proportional to the object's [http://en.wikipedia.org/wiki/Mass mass]; the constant of proportionality between the mass and the force is known as gravitational acceleration.
* The [[force]] acting on a certain object due to [[gravity]] is proportional to the object's [http://en.wikipedia.org/wiki/Mass mass]; the constant of proportionality between the mass and the force is known as gravitational acceleration.
===Properties===
===Properties===
[[File:Proportion2.jpg|center]]
[[File:Proportion2.jpg|center]]
