Point A=(0,0)and B=(3,0).Which of the following choices of C will make traingle ABC a right traingle? I try to work it with vector for whe I subtract (0,0) to (3,0) and gives me (-3,0) this only give me straight line.

Answer 1

I don't have the choices, but I suspect (0,4) was one of them. Then you'd have a 3-4-5 right triangle.

If that's not one of them, then you'll have to check dot products. If one of the dot products is zero, then those two vectors are orthogonal.