Intersection point between 2 curves:

You can create an Intersection point between 2 curves by selecting two curves. The created intersection point is the one closest to the selection positions on the curves. The computation takes into account:

the complete curve support (option Extrapolate = YES),

Curves are virtualy extended and the intersection point is created.(

In the same case, with Extrapolate = No, the "no intersection" message will appear in the alpha bar

You can select:

an EDGE of a shape,

a curve SEGEMENT.

You can automatically detect the intersection between two curves by holding down the left button of your mouse and put it on the intersection.

Use + and - key  of your keyboard to change the square dimension during the detection.