This video lecture from Conic Sections (F.Sc. second year Mathematics) covers: some theorems on circle like length of the diameter of the circle having centre at origin is 2a and perpendicular dropped from the centre of a circle on a chord bisects the chord. 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.