Hi all,

Not even sure this is in the right category applogies if it isnt.

Just wondered if someone could help me with an issue that i cannot seem to figure out below is an image excuse how crude it is, but i think it explains what im trying to do.

Im trying to get the distance from point A to entry point of the "circle/sphere" designated B i also want to get the distance from point A to the exit point of the "circle/sphere" designated B on both paths to C and D.

The Radius of "circle/sphere" B = 162

Total distance from A to B is 326

Total distance from A to C = 461

Total distance from A to D = 621

X,Y,Z coord are as shown on image.

Hope this is enough information for anybody willing to help me out.

If someone could explain how to do this in as simple terms as possible i would be very greatfull.

Im not that great at maths but im keen to learn.

Many thanks in advance.