Distance from A to B result is incorrect

[wanghchen]

I think this place's result should be 2.8284271247461903

By the way， I think it might be better that uses the angle rather than radian in the result of the angle

To be honest，I even think the result is wrong， when I saw the result first and was not aware of that the result uses the radian, which does not fix someone's direct congnition. Or, can use the comment says that the result uses the radian to calculate.