This video lecture from Geometry (F.Sc.second year Mathematics) covers: Question number 5 and 6 of exercise 4.3. In Question 5 we show that the triangle constructed from three given points is a right triangle using the concept of slopes. In question 6 we are given with three vertices of a parallelogram and we find the unknown vertex using the concept of slope. 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.