This video lecture from Vectors (F.Sc. second year Mathematics) covers: Question 5-7 of exercise 7.1. In these questions we learn how to calculate the position vector from a point lying on a given vector and the unit vector of a given vector. In question 7 we find the fourth vertex of a parallelogram where other three vertices are given. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.