calculating position of a point knowing two reference lengths

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Hi, I would like to know if there is a way to calculate a unique position for Point A knowing the lengths l1 and l2 which are variable string lengths. Point A can move within the range shown below. 2D equations are fine but in reality the strings have a slight 3D components as well.

So if there is a general form of equations for l1,l2 to be 3D vectors in space, that would be better. Or do you need a 3rd length, l3?

Thank you!

Mick