[noob] How to use custom classes?

programming flash
1

My document class:

package {
	import math.mathFuncs;
	import flash.display.MovieClip;
	public class project extends MovieClip {
		public function project () {
			var myArea:area = new area();
			trace(myArea(2,5));
		}
	}
}

My math class:

class math.mathFuncs {
	static function area(l:Number, h:Number) {
		return l*h;
	}
}

How would I use the area function from my master document class?