STEP 4: Fill the cone three times in total and empty into the glass. Three cones of water should fill the glass to the top. The glass is a cylinder with volume base x height.

How to prove the volume of a cone is ⅓ height × πr² slideshow Click to see a step-by-step slideshow. WHAT YOU NEED: card, compass, scissors, sticky tape, a glass and a jug of water.