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What does the curve of $z=xy$ look like ? To find the area of the surfaces for the part of $z=xy$ cut off by cylinder $x^2+y^2=a^2$ what will the intersection of the two surfaces look like?

projectilemotion
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shadow kh
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    Concerning visualization of 3d graphs, you can use this for example: https://academo.org/demos/3d-surface-plotter – MathematicianByMistake Jan 15 '17 at 12:50
  • @MathematicianByMistake Thank you for information about this site. Fantastic tool this 3d-plotter, if you know more such sites please give some info :) – Widawensen Jan 20 '17 at 10:52
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    @Widawensen My pleasure! For the 2D case I find this one very very helpful- https://www.desmos.com/calculator .As my school teacher used to say, a little plot can often help intuition a lot.. Now if we could only find an n-dimensional plotter.. :-) – MathematicianByMistake Jan 20 '17 at 11:00
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    I also forgot to thank @Mathematician ByMistake its really helpful . – shadow kh Jan 20 '17 at 11:02

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