if |A|=2, |B| =4, |C| =5, find the vector sum a+b+c in ordered pair notation, also find the angle theta

To find the vector sum, a+b+c, in ordered pair notation, we need the actual vectors A, B, and C. Given the magnitudes |A|=2, |B|=4, and |C|=5, we can't determine the vectors themselves without additional information. Magnitude alone doesn't fully describe a vector.

In order to find the angle theta, we also need the vectors A and B. Without them, we can't calculate the angle between the vectors.

If you have the direction or components of the vectors A, B, and C, please provide them so we can give you the desired information.