Answer : The resultant of two vectors acting at a 90°-angle can be determined from the diagonal of the rectangle.
Explanation :
Vector is a quantity that have both magnitude as well as direction.
For example :
Two vectors a and b are acting at a [tex]90^0[/tex] angle, there resultant can be determined from the diagonal of the rectangle(as shown in the attached figure).
Hence, the correct option is (D) " diagonal ".
