This video lecture from Geometry (F.Sc.second year Mathematics) covers: Question number 3 and 4 of exercise 4.3. In Question 3 we show that three given points lie on a same line (they are collinear). Question 4 is about finding the unknown x-coordinate of a point, where two lines are given parallel and perpendicular to each other. 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.