How to find second point by adding distance in first point?

Question

In the 2D. I have calculated distance 7.071068 from the coordinate:

1. (10, 10)
2. (15, 15)

But now question is that i want to find Second point by Adding distance in First Point. How to Do this?

Answer 1

It's not enough to have the distance between 2 points to find one point given the other. You have a full circle that attend to this demand (distance).

You also need the angle between the two points (let's call it phi)

If we call distance d, to find P2 from P1:

X2 = X1 + d*cos(phi)

Y2 = Y1 + d*sin(phi)