Re: HSC 2015 4U Marathon
You can easily rotate about oblique lines. But creating a solid by rotating about a curve is pretty meaningless. Assuming you want to take slices perpendicular to the 'axis' of revolution, these slices won't be parallel, so they'll crash into each other. It's like drawing a wavy line on an aeroplane, then telling the pilot 'try to rotate around that'. What would it even mean?
You can easily rotate about oblique lines. But creating a solid by rotating about a curve is pretty meaningless. Assuming you want to take slices perpendicular to the 'axis' of revolution, these slices won't be parallel, so they'll crash into each other. It's like drawing a wavy line on an aeroplane, then telling the pilot 'try to rotate around that'. What would it even mean?