Flash experiments: omtrek cirkel

I have to do this in Dutch because I have no idea what’s it called in English, sorry.
It not really important, and will be used in a project which has little to do with this explanation.

Een klein testje om de omtrek en de oppervlakte van een cirkel te berekenen.
Het moest van ver komen dus heb ik het ff opgezocht:

Omtrek = pi * diameter = 2 * pi * straal
Oppervlakte = 1/4 * pi * diameter2 = pi * straal2

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Update #1: For my English readers:
(more about circles here)
“omtrek” = circumference
“oppervlakte” = area (read more: circle area)
“diameter” = diameter (diameter)
“straal” = radius
(look more math stuff up at at Math Open Reference)

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