Assuming that the dart curves are supposed to go through A12 & A13, you’ll want to use the “Curved path” tool; it’s the squiggle with four (4) black dots.
However, it looks like A12 & A13 are farther apart in the picture using your measurements, & they’d need to be a lot closer together not to reverse the curves’ directions.
It might also help to make the curves’ angles in relation to the angle of another line, such as I did in this experiment:
It should be noted that I used a “Simple curve” to make that curve, but am pointing to “Curved path”. If you can’t see the entire picture, with the curve qualities filled in, just click on it & it should open as an overlay.