Answer Happy

A type of decorative tissue paper is sold in rolls of radius 9 centimeters with a cardboard core of radius 3 centimeters. The thickness of a roll is measured from the outer edge of the core to the outer edge of the roll. If the paper is used until the thickness of the roll is reduced to half of the original thickness of the roll, what fraction of the original volume of tissue paper will still be on the roll? 00|00 MO