Suppose I have a pantograph, as illustrated below.
The base is fixed in that it doesn't move around in space, but arms a and b are able to rotate freely around it, thus moving the tip around according to the angle of a and b from the vertical.
Is there an equation that will describe the x/y position of the tip, given the angles of the arms a and b relative to the vertical, and vice-versa?
If it makes it easier to use angles relative to the horizontal, or something else, that's also fine.
And if this isn't actually an example of a pantograph but is something else, please feel free to edit the question.