This video lecture from Conic Sections (F.Sc. second year Mathematics) covers: Question number 1-2 of exercise 6.3. In these questions we prove that normal lines of a circle pass through the centre of the circle and prove that the straight line drawn from the centre of a circle perpendicular to a tangent passes through the point of tangency. 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.