



 
Hi Nick, Your last sentence says "The problem is the circular bottom end of the tube, it isn't flat, that The bottom of the test tube is not a halfcircle it's a half sphere. The volume of a sphere of radius r mm is 4/3 π r^{3} cubic mm so add half the volume of a sphere of radius 31/2 mm to the volume of the cylindrical portion of the test tube. Write back if you need more assistance,  


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