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Thread: A question about converting cylindrical coordinates to rectangular coordinates

  1. #1
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    A question about converting cylindrical coordinates to rectangular coordinates

    I have a problem figuring something out when it comes to the formulas that are used to convert from cylindrical to 3D rectangular coordinates.

    The formulas are as follows:

    x = r cos theta
    y = r sin theta
    z = z

    If theta is the angle between the X axis and r, we can use basic trigonometric functions to find X when we know the value of theta and r. But I don't understand why this applies to the Y axis too.
    The way I understand it, the Y axis isn't even part of the triangle that contains the angle theta. Isn't the triangle that contains theta defined by the hypotenuse r and two sides, the X axis and a (imaginary) line between X and r ?
    What am I missing here ? Can someone please help out with this ?

    Thank you.
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  2. #2
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    Re: A question about converting cylindrical coordinates to rectangular coordinates

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  3. #3
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    Re: A question about converting cylindrical coordinates to rectangular coordinates

    Oh, I get it now, lol. When drawing the "imaginary line" I was talking about , you just make it parallel to Y axis. Thanks alot.
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