This video lecture from Conic Sections (F.Sc. second year Mathematics) covers: Question number 3-4 of exercise 6.3. In these questions we prove that the midpoint of the hypotenuse of a right triangle is the circumcenter of a triangle and prove that the perpendicular dropped from a point of a circle on a diameter is a mean proportional between the segments into which it divides the diameter. 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