This video lecture from Geometry (F.Sc.second year Mathematics) covers: Question number 12 and 13 of exercise 4.1. In Question 12 we find the third vertex of an equilateral triangle where two vertices are given. In Question 13 we find the points trisecting the line (dividing it into 3 equal parts). 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.