Question

Two airplanes strart from the same point, one travelling 250 km E and the other 180 km N. What is the vector difference of these two displacements?

Answer 1

These are two sides of a right triangle, 250 km and 180 km, so the vector difference is the hypotenuse, the length of which is the square root of the sum of the squares of the two sides.

Answer 2

hope this helps you
and you can use this hypotenuse concept only when the vectors are perpendicular:)