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Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in _menu_load_objects() (line 579 of /customers/d/a/8/freewiski.be/httpd.www/includes/menu.inc).

de cirkel

Hoe is de middelpuntsvergelijking van de cirkel tot stand gekomen ? 
 
M(x1, y1) en straal r
 
(x-x1)² + (y-y1)² = r²
Created by ML