This is a math question featuring a glass of water that is made out of two circles, the base and the rim, where the centre of the rim is directly above the centre of the base. You have a glass of water and you tilt it so that the water level touches the rim. You draw out the water level at the bottom of the base. Using only linear measures (You are allowed to measure anything that you can use a straight ruler to), find how full the glass is as a fraction of the total volume the glass can contain.
Hint: The height of the glass does not matter.