R is the resultant of two vectors P¯ and Q¯ . If R makes an angle of 900 with P¯ and 300 with Q¯ , then the ratio P¯ : Q¯ is
1:3
3:1
2 : 1
1 : 2
Vectors are added by parallelogram law. Note that the angle between the vectors P¯ and Q¯ is 1200.