We would like to pack as many circles of diameterdas possible into another large circle of

diameterD. We denote byN(d;D) such number.

(a) Give the upper bound forN(d;D).

(b) Give in details how we can calculate a lower bound forN(d;D). Find an explicit value for

Nwhend= 9mmandD= 72mm.

ANY IDEAS?!