Plane vector concept problem ~ quick solution, online, etc., thank you.

1. We call a=xi+yj as the (orthogonal decomposition) form of vector a, (xi) as the vector of vector a on the X axis, (yi) as the vector of vector a on the Y axis, and the ordered number pair (x, y) as the coordinate of vector a in the rectangular coordinate system, which is denoted as a=( x, y).

2. In the plane rectangular coordinate system, the coordinate of point P is P(x, y), so the vector |OP|=(√(x? +y？ ) )

3. Generally speaking, for any vector A on the rectangular coordinate plane, if its starting point moves to the origin O and its ending coordinate is P(x, y), then the vector OP=( x, y).